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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G Gundam has some problematic shit in it. At least the pilot of the Tequila Gundam (yes, it's called that) is more or less a normal character. The depiction of the pilot and Gundam from Neo-India are just racist.
Well... ya' know... "fair and balanced" and all that...