For some reason, I never liked CPMA. It completly changes the game and not even 25% to the original.
OSP rawks for me as it gives lots of options to tinker around with for more pro settings and also removes some of the annoying trickjumps which made the original q3a unfair. But, atleast it is 90% similar to the original game.
I still love playing CTF games and CTF maps of Q3A are lame. Besides CTF, every section of Q3TA is even more lame.
Anyway, its upto to individual taste. Sometimes, I prefer UT2004 over Q3 due to gameplay issues. I feel UT2004 is much more balanced games in 1 on 1 DM games, but for pure adrenaline rush, Q3 rawks. Hu..hu...hu..hu...