I have a Chip McCormick in my competition AR .223 and like it a lot,,It's 'drop in' and no adjustments to worry about having to fool with down the line..Breaks crisply at about 3# and reliable..
It really depends on the type of shooting you do the most...For hunting, or light use, there are a lot of good ones on the market...For severe, or hard/high round, use, the simpler, the better..If you are into slow fire type competitions, then the highly adjustable will make you happier..
I've had one of the JP triggers and it has a couple of adjustment points..Their instructions for installation were not really clear to me at the time (hopefully that's improved) and I was at the point of sending the lower and trigger to them for adjustment for a minor charge..
A lot of people have personal preferences between a single and two stage trigger..For most shooting, I prefer the two stage, but the single stage has it's benefits as well for certain applications..My CMC is a single stage and works well for action competitions..