I own both. Very fun games. I'll be honest, Street Fighter is one of the most boring series to me compared to most Fighters.
The gameplay isn't bad, of course(it's amazing), but the characters for the most part just scream "eh" to me. I'm a big fan of noteworthy characters. It does not help that there's too many similar gameplay clones in the series, even outweighing SSB.(note, I mean ones you can play as normally, not clones in general)
As for Armageddon, I liked the Wii version the best. The controls were amazing. It only lacked online play, but beyond that, best version, IMO. Character creation was extremely well-made, too.