As for the CZ I haven't found anyone who doesn't like the feel of it. Try them each out if you can.
CZ75's grip was too small for me. Felt like a 1911's grip, too thin. Sig's just fit me perfectly and thus, they feel better = I shoot better. I've yet to find a pistol with better ergonomics. I like both the base grip panels and the E2, both work perfectly for me.
Fit and personal preference will be different for everyone. There is no right answer here.