When they both skated the same obstacles, David tended to do the better tricks. The only reason I don't think David is the clear winner is that Tom has consistently been skating other stuff as well that looks really tough to skate, like the 5050 in north beach and the smith to pop into the ramp at that one church. David definitely hit some random shit nobody else did too though, like the switch 5050 he did in San Jose. I'd really say its definitely a toss up between those two, nobody else has a chance.
Somebody needs to put the video up on youtube also. The videos on this site are always too big to load properly through my stolen internet.