Well i've shot a fair bit of paint from different manufacturers.
Zap Chronic is a good winter ball. Never tried Amp but have heard good things.
Celtic......just no, trust me on this...no
Tomahawk, flys pretty well and doesn't break in the gun but to be honest, doesn't break on the opponents as often as some paints i've shot.
32 degrees team colours......I can only assume I had 4 boxes from the worst batches ever made! Broke in shockers, impulses and angels.
Draxxus.... Blaze, pretty good for training, attractive price, midnight....good for rec-ball at best in summer. Not a bad training paint in the winter. Inferno is nice, mostly round and pretty consistent.
Hellfire....no contest, the best paint I have ever seen. If you can get it, try hellfire pro (flat packed boxes) it is unreal!!!!
To be honest your best bet is to try some different paints and see what you like. Asking for advice is fraught as sponsorship interfers with some peoples opinions, as can only be expected. Bad mouth your sponsors paint and you'll be unsponsored real fast!!!
Laterz
Ian