Queue wise, I would have to go with TSM; it's absolutely enchanting to see all your old toys in huge form, and I think Imagineers did a great job with it, especially with the Mr. Potato Head animatronic! Buzz's queue is just... there I guess, and MiB's is really, really well done (I mean really), but for me it cannot live up to TSM's queue.
Ride wise, MiB completely, hands down, no argument. Buzz is fun and I like doing it, but I was absolutely let down with TSM's ride experience. I did not find the shooting system easy-to-use (it feels as though your arm is about to fall off, sheesh), and the virtual aspect just doesn't do it for me. It was a big disappointment for me, just like Nemo's takeover at The Seas. Like I said, Buzz is fun, and it's got some cool sets and whatnot, but the entire aspect of the HUGE and extensive sets and awesome spinning and multi-layered storyline and whatnot of MiB is absolutely grand.
MiB for me.