This is going to be the ultimate comparison between the two. If you are not convinced after this, then you are beyond my help. First of all, my reference will be the anime. So don’t talk to me about the manga or the video games cause most people won’t see them and they can’t be used as a standard. Second, if you think that Great Mazinger is better than Grendizer then you are just stubborn and there won’t be any way to convince you of some thing very obvious. Third, about they special 5-6min clip of all of gonagi’s robots, that doesn’t mean anything. The clip was just an introduction to Mazinkaiser and it can’t be used as a standard. Think about it, Mazinger Z destroyed a lot of his enemies only by his rocket punch, JUST THE PUNCH. Great Mazinger destroyed almost 6-8 monsters just by running next to them. VENUS A DESTRYED 2-3 MONSTERS WITH HER MISSILES!!! So the clip doesn’t count. The only reference for this comparison will be the TV series for Mazinger Z, Great Mazinger and Grendizer, the OVA’s and the movie for Mazinkaiser. Let’s begin:
First of all, to know how tough some one is, you have to see how tough there enemies are. Mazinkaiser’s enemies were the same enemies that Mazinger Z and Great Mazinger defeated before. Grendizer’s enemy was the Vegan Army. The highly scientific and sophisticated army with warriors that is far stronger and smarter than DR. Hell and the Mikenese Empire. Here is a clip were Mazinkaiser and Grendizer are locked in the same situation and they both react exactly in the same way. Watch what happened to Mazinkaiser’s enemy and what happened to Grendizer’s. I guess this tells you that Grendizer’s enemies are smarter. When you think about it logically, the Mikenese Empire were underground for a long time and they only have there own technology to relay on while the Vegans have there own plus several other civilizations that they conquered. The Mikenese Empire were living in CAVES while they were battling Great Mazinger with animals. The Vegans were living in highly sophisticated military bases and attacked Grendizer with an arsenal of space saucers and powerful robots controlled by some heavily trained warriors. I guess this concludes that the Vegan forces were better than the Mikenese Empire and DR. Hell.
Second, Creation. Mazinkaiser was build by DR. Juzo Kabuto, The brilliant scientist who combined the Mikenese Empire technology with his improved metal to build Mazinger Z in a BASMENT!. He also build Mazinkaiser secretly in a small base and kept it hidden. I can’t say for sure if Mazinkaiser’s Technology (NOT ARMOR) was build using the Mikenese’s or DR. Kabuto’s own intelligence. But either way, one man or a dead society’s technology can never be compared to an entire civilization’s who are known for there highly sophisticated NON military technology combined with the Vegans Military experience that produced Grendizer as there most powerful and most advanced weapon.
Third, Armor. Mazinkaiser armor is Super Alloy new Z. I am not sure about this but I think it’s 6 times more powerful than Great Mazinger’s. Grendizer’s armor is Space Alloy Gren and it is from another planet and no one knows anything about its strength. The only way to compare them is what happened to them in battle. Mazinkaiser was let go from outer space and fell down on the ground without a scratch. Grendizer was thrown by a huge explosion and fell in the ocean without a scratch. Some might argue that one landed on ground and one on water. In my personal opinion, from that high it wont make any difference but I respect there argument nonetheless. Mazinkaiser was thrown in a volcano and came out unscratched while Grendizer didn’t, just because Grendizer has never been thrown in a volcano doesn’t mean that it would be harmed if it was so this can’t work for comparison. Some Fans might argue that Grendizer’s spazer was damaged several times in the series. Still, the same weapons that damaged the Spazer didn’t damage the robot. That means that the robot’s armor was stronger than the spazer. Grendizer got his arm ripped off and his leg melted in 2 episodes out of 74 witch means that the armor is vary tough but not invincible. Mazinkaiser armor didn’t get damaged in any of the 7 OVAs or the movie. JUST BECAUSE IT WASN’T DAMGED DOESN’T MEAN THAT IT CAN’T BE DAMAGED, it only means that none of its enemies was tough enough to damage it. Since I already established that the Vegans are far stronger than the Mikenese. Then that means that if Mazinkaiser fought the Vegans, there is a high chance that the Vegans will damage it the same way they did to Grendizer. So in case of armor, there is no conclusive evidence that one is stronger than the other. But it obviously means that Mazinkaiser’s armor is neither inferior nor superior to Grendizer’s.
Fourth, strength. The best example for strength is the pictures of Mazinkaiser lifting an entire ship and Grendizer ripping a nuclear reactor (I think) from the ground and lifting it. From the pictures it is obvious that Mazinkaiser is stronger. But after seeing a picture of Mazinger Z lifting an enemy that is almost 10 times its size, I personally won’t connect how much a robot can lift with how strong it is. (Personally, watching Mazinkaiser lifting that ship made it look ridiculous rather than strong. When I saw it I pictured an ante lifting a guy and throwing him away)
Fifth, Weapons. Both robots have several advanced weapons. I can’t compare each one so I’ll take strongest weapon each have. The Space Thunder for Grendizer and The Breast of Fire
For Mazinkaiser (I know he calls it differently in the Ova but I think this one makes more sense). The breast of fire is Mazinkaiser’s strongest attack. In its first appearance some of its enemies melted for being near the attack. That is how tough it is. But, the three enemies in the pictures were able to block it. The first two diverted the beam while the third used its armor to block it. The beast melted inside its armor but the armor took the full attack of the breast of fire and it didn’t get damaged. That means that a primitive beast of DR. Hell’s had an armor that was strong enough to block Mazinkaiser’s most powerful attack. That’s how weak it is. And I don’t think that this monster’s shield is stronger than the shield used by King Vega’s special guard. Witch support the idea that Mazinkaiser would have a tough time fighting the Vegan army just as Grendizer did. Grendizer’s space thunder destroyed most of its enemies and it couldn’t harm some. So there are no clear points of how strong or weak it is. So about how powerful there weapons are, no clear evidence that one is stronger than the other. In Mazinkaiser’s OVA, Mazinkaiser’s system got damaged from Baron Ashura’s thunder attack (of course, Grendizer’s space thunder is stronger than Ashura’s). In Grendizer’s TV series, Grendizer’s system got damaged from a heat attack (of course, Mazinkaiser’s breast of fire is stronger that the heat attack). So basically, each robot’s most powerful attack will work very effectively on the other. Still, no clear cut.