Icon defense vs bcm vs geissele

I'm building an upper for a general purpose build. I'm going to run a centurion 16 inch lightweight midlength barrel with a vortex razor gen 2 hde. I'm just deciding between the mcmr or geissele mk16 15 inch. Mk8 15 inch and even the newer icon defense drivelock. Weight isn't a total issue I just don't want it to be really heavy due to the lpvo and I'll be using it for long treks for coyote/boar hunting. So a moderate weight. I don't have big hands so it has to feel right as well. Which is more rigid and has decent heat dissipation?