I've tried a few. I settled on a pair of Louis Garneau Air Carbon gloves.
They've stayed cool enough for me during the summers.
I gladly paid $40. for them, but they can be found now for $20. I think they are a great value.
Very comfortable, but not so much so that they make me feel disconnected from the road.
It's hard to know what you personally need/want.
I like gel. I like quality materials that can be washed a lot.
The Louis Garneaus I chose made a huge difference in my riding experience.