My current favorite - Magpul Industries AR Rifles MOE-K2+ Grip

This is my current favorite. Grippy without being aggressively rough. Easy to grab and hold onto without the tendency to grab and rub that some of the more aggressive textured hard plastic grips have. The only negative is it can lightly stick to some gloves that have rubbery palms on oppressively hot days if left in the sun (not a serious concern unless your rifle is laying on a table for awhile in the summer). Despite that, I've never had the coating peel. I keep spare optic batteries and any allen keys that I would need to remove/tighten my optic mounts in the compartment.