Never watched any Gundam shows, but I played a Gundam video game one time on a friend's console. I ended up picking that Ball thing a lot, because it was cheap but could still pack a punch. So for the price of one normal mecha I could get like 3 respawns with that Ball and just float around on the periphery sniping people all day. I wouldn't want to be inside the Ball, since they get destroyed pretty easily, but if I could remote-pilot it like a drone, that would be pretty sweet.
Better yet, forget the Ball and just give me 200 normal FPV drones (or 2 million, for the price of even one Ball) and I can just send them one at a time to drop bombs on all the mechas out there. Some* say drones are a weapon for homosexuals, but if it works, it works.
But in terms of normal mechas, I always liked the look of the Zaku. I did a gundam roleplay one time and that was the model I picked. I don't know anything about its specs, I just liked the look of it. A lot of mechas look stupid and cartoony, but Zaku looks pretty solid, like something a military would actually design and mass-produce, not just the fantasy of some cartoonist who smoked a ton of weed.
*Going by the translated words of a Chechen soldier in a Ukraine video I watched one time.