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.
Hell yeah! May not be a Gundam, but it was the prototype that lead to all the other mechs for the Wing series. So I still more or less count it and its sequels on-par with the Gundams. I got an Endless Watlz special edition Master Grade model and was just sick! So was the whole set from that line of models, really need to finish collecting them. Aside from TG I, I have: Deathsythe (non-Hell), Wing (non-Zero), Heavyarms (pre-custom), and Sandrock (haven’t built it yet though). It is nice to see what the original versions look like with the Endless Waltz treatment.