Mine is pic related, the Victory Gundam. What I like about it is how modular the mobile suit is. It's the result of years of ms tech late into the Universal Century where now the Gundam is mass produced. In the show the rebel forces are shown to have a stockpile of Gundams in a bunker so they can burn through parts.
Honorable mention to the RX-79 G ground type Gundam from 8th MS Team.
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Love that game. Still have a working copy on the ps2 that i bust out every now and then.
My cousin had it and I used to borrow it from him along with Fed v Zeon and Zeonic Front, ZF is another gem that gets slept on, it's like Rainbow Six but with mobile suits.
Zeonic Front is so fucking good.
Please everyone play zeonic front and then talk to me about it