i never cheated on my girls (yes, and this is no lie)... but i know that men are most of time not able to hide what they did... but those men deserve it anyway...
Women are slick with it. But I vote for men because they have more practise. It is harder for most women to fake their feelings... so they get exposed. Besides most men dont discriminate.
You are ultimately asking who are better liars, cheating is about being dishonest. More men cheat than women, but woman are better liars. So women are better at cheating.
Yet men and woman cheat for different reasons....go figure.