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.
Not the biggest Gundam guy but I like the Zaku, the main Gundam, and the Sandrock from Wing since it was the first one I ever saw.
I know ‘real fans’ tend to not like Wing but it was such a great entry point and the designs are so great. Wing Zero is still my number 1.
Wing is really emblematic of trends in anime at the time, which makes it a bit dated but also I grew up with anime of that era so I love it a lot.