Why don't you stealth around your shard's main PvP "arena" and see for yourself? And better yet try to re-create the templates you see and run with each a while. No other way.
I can guarantee most gimps will be using magery, ninjitsu, necromancy or chivalry in various combinations helped by parrying or healing or whatever. It's too easy to spot the 2-3 dominant combos of the above but don't forget that it's also about the right items and THAT'S what you should be taking notes of mostly.
Don't lurk around Champ spawns, templates there are better suited for team-work and PvP/PvM sometimes.. Or just the occasional Stealth/Ninja gang-bang. Not really dependable for Free-For-All PvP.