>>23373550 (OP)Most don't have enough material. Seed does. Especially if you count Astray. There is a ton to play with there.
00 does. It has a few manga with tons of units. Even not counting the mangas, 00 has enough politics and sides for it to be very interesting. Joining one of the 3 powers and not agreeing to teaming up with everyone else.
Wing has an interesting political landscape but it lacks characters. It's way too focused on a few characters and all the random politicians are too bland to be focused on. You'd need to mangas and novels to flesh it out. It also lacks units. You'd need to make tons of variants especially since everyone uses the same units early on. You'd be using a Leo and fighting against Leos for a ton of it. I've always wanted a Wing game where you play as a grunt for OZ or the Alliance. During missions, a random Gundam would have a small chance to attack, sometimes more than one. They'd be nigh unbeatable and your objective would be to either escape or just force them back. But you'd have a small chance of damaging them and then you could customize your unit with Gundam parts. Like if you made Shenlong drop its glaive you could take it for your unit or send it back to HQ and they'd mass produce the weapon for everyone.
AGE should be interesting but despite focusing on a 100 year war I feel like we barely know the setting.
IBO could be cool. Especially if you use it to reveal some of the Gundam frames we haven't seen.