I've settled on the "Aggressive Checker" grips from CZC (thick profile). I've tried switching over the LOK palm swell grips and while they were more comfortable to hold, I didn't get the same traction during live fire. There's a big difference between how the grips feel in the hand vs how they feel under recoil, so trying out multiple options is the best bet. I know a lot of guys love the LOK grips but it's all personal preference.
Also, it may come down to what kind of grip you're using. I've found that when torquing in with both hands the palm swell grips would work against me, whereas the flat CZC grips provided more traction. However, if I didn't use this type of grip then maybe I would prefer the palm swells...