Bars are a very personal thing I think. You need to work out what suits you, the bike & geometry etc.
Personally, my bike was built with Truvative Nior carbon risers, it was ok, but the bars were a bit wide.
So I went to some moots flat bars, and ordered the wrong size, they were like 580mm or something..
So then I went wider and got some 610mm(ish) moots bars, which were better, but felt too low, so I re-did the stack and put the Moots stem at the top, but it still didnt feel right. I also noticed alot more high-pitch vibration on the moots bars.
Finally I picked up some Enve riser bars, cut them down to about 610mm and they're great!
So, in the end, I've concluded I like the rise (~20mm) on my bars.