For me it was definatly Seed. Above all the rest I simply enjoyed it the most its music, characters, mecha and evverything else just draws you into it and never lets go.

As for the rest I enjoyed Gundam X the most out of the others listes. Given I have not seen Z, C, ZZ or all of Mobile Suit Gundam as Toonami pulled it due to 9/11. Given what I did see of MSG I didn't love mostly due to the wooden voice acting and horrible animation. After X I would have to go with wing... It was mindless but I loved the Gundam and it was the series that first made me want to start looking up the past ones. 0083 and 0090 were both decent but there simply wasn't enough of them to really bring me in. The same thing can be said for the F91 movie and the 8th ms squad. In the bottom of my listings you have G Gundam which frankly I just hated I know it was suppose to be sort of a paredy but everything about it was just bad to me. Finnally on the absolute bottom of the barrel is SD gundam which I couldn't manage to watch 5 minutes of without having the urge to kill someone.