Hand sweat or wet conditions adds moisture to your grip and can cause the grip to slip. In this case, a grip with moisture control will provide more traction.
Do you prefer a firm grip with vibration at impact or do you like a softer grip which dampens the vibration? Find a feel that is stable and comfortable in your hands.
A smooth grip surface will feel softer with minimal texture. A rougher texture grip has more pronounced patterns and a firmer feel.