i haven't been playing long, but I've played with a few markers occasionally. The invert mini, poopy rental tippmanns, spyder pilot, Dangerous Power Fusion FX, an Etek, and an old bob long gen 1 victory.
And then I have my pump. 90% of my eliminations on opposing players are with my pump. I think it's just the spirit of the gun, or the lack of spirit in the others even. You have more control over everything the gun does, no hair triggers or 10000 balls per second fire rates. No batteries. There's some sort of zen in playing pump.