The best guys to light threebet all play positional, have a wider range OTB or in the CO. They all have a fold to 3bet in the 75% range or higher and you want to be 3betting hands that aren't good enough to raise/call but can still flop great with blockers vs there possibility of having AA KK and AK, or will flop better on raggy flops like suited gappers.

Lastly, look for those guys that don't fold to 3bets often and cll a ton, but tend to fold to any flop that misses. thses guys are huge for the winrate.