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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He saw the main theme of "boys' love language is karate" and realized Imagawa understood Mobile Suit Gundam better than most people.
i should (once i've seen them all) rank all the non tomino gundams by how well i think they understand gundam
'0083: seems to think the main ideas of gundam are 1) zeon is cool and spacenoids are treated poorly, 2) zeon are all 100% nazis, and 3) the protagonists should be as unlikable as possible. in fact, what sets gundam apart from other robot shows is that gundam is about characters who it's possible to feel emotions other than anger and frustration towards'