
Originally Posted by
Serra
I'd say start with UC and work your way through in the chronological order. Not only is it the most expansive and detailed timeline, there's also a lot of things in later series that pay tribute to things that started in the UC timeline. So start with the original Gundam, 08th MS Team, 0080, 0083, Zeta, ZZ, and then Char's Counterattack. If you get get through all that in 6 months, you'll be in perfect shape to watch the first six episodes of Unicorn before the final episode comes out (but that's a lot of anime..). After Unicorn is F91 and Victory, and then Gundam X (which may or may not actually be in the same timeline..). That said, one of the issue with watching UC in chronological order is that you have to watch more modern things before some of the more dated things -- the first two series were the original and Zeta, so things like 0083 and 08th MS Team are going to make it harder to watch Zeta.
Then you have all the alternate universes. You said you've seen Wing (I'm assuming back when it aired on Toonami -- go back and rewatch it if you want to see something that has really not aged well..). A lot of fans hate SEED and Destiny. Personally, I liked SEED, but agree that you're probably better off ignoring Destiny unless a third season/movie gets announced. The first season of 00 was excellent, the second continues the story, but was a pretty big step back from a lot of things that made the first so good, and then the movie will make you regret the past two hours of your life, so there's that.. There's also G Gundam (which is not the best, but is kinda worth watching because of how out there it is, but I imagine, like Wing, it will not have aged well..) and Turn A (which is good, but is also really really weird and probably shouldn't be so appreciated..). The last series is Age, which I personally haven't seen, but I hear gets progressively worse as it goes on.
So to answer your question, I'd say start with the UC timeline and watch all of those just to get the complete picture. Afterwards, probably just watch them in the order they were produced (skipping any that don't sound appealing) -- that way you can rewatch Build Fighters and appreciate all the references to past series outside of just the gunpla.