Wow! I think that Sunstreaker looks cool!
I personally like easy and fun transformations.
Even some of the alts are pretty fun like Hot Rod/Mirage,Windcharger but alot of them were too complex and it didnt make them any more posable.
By far I think the Beast Wars figures are fun and very posable. Classics also had some great ones like Mirage! That guy can pose like no ones buisiness!