Board Thread:Monster Discussions/@comment-10992179-20130628021244/@comment-133597-20140210074235

I'd have to give it to Kiryu overall.

Aside from the Absolute Zero Gun, it was also made with versatility in mind. All the others (MG1, MKG, MG2, and MOGUERA) were specifically created for defeating Godzilla and only Godzilla without much thought for anything else (not to say they couldn't do well against monsters, but that they were just that specialized).. Kiryu was created to defend Japan against not just Godzilla, but virtually any attacking monster.

Kiryu can, indeed, fly, but it doesn't do so often (even being carried into battle), presumably, because of the fact that, unlike other Mechas, the issue of limited power (and budget) was brought into play, making it more "realistic", and pretty much everything, from the operating systems to basic movements to using its energy weapon to flight, all take power to do, so even though it's said it can operate for up to 2 hours, I'm guessing that is based on solely being turned on and not doing a lot of fighting and using its various abilities, so it's really meant to quickly beat down the enemy monster with its weaponry and, if necessary, physical attacks and then, while the monster is stunned and Kiryu itself hasn't used too much juice (40% of its full power after all), quickly finish it off with the Absolute Zero Gun (much like they tried to do in both of Kiryu's fights with Godzilla). So, simply put, Kiryu was also not made for prolonged fights (at least not without being able to recharge easily).

Mechagodzilla II is definitely the most powerful in terms of brute force firepower, but it's agonizingly slow on ground (if possible, even slower than Godzilla when walking), and even its flying/hovering aren't exactly fast, so MG1, MGK, MOGUERA, and Kiryu would be able to run circles around it (or fly in MGK's case, and roll in MOGUERA's case, with its roller system).