For such a juggernaut, the Suns are strangely monolilthic and inflexible. They do the same thing over and over in order to win: score in the same ways, Stoudamire down low, Nash breaking down the defense and kicking out, lots of three pointers. That's all there is to it. Do you really think they could make adjustments to a team that's beating them?
I wouldn't say they're one-trick, but they're pretty much the WYSIWYG team. The Spurs, on the other hand, can win with offense, defense, can run, can slow it down, can post-up, can bomb away, can win on penetrations. A much more versatile team.