aiky, Its not a case of which Grip is Best, But which Grip suits you Best!
Personally I love the Winn G8 Midsize Grip. Even though I don't have Bloody great Navvies Hands. I like them Cause they are very Soft and sticky and I don't need to wear a glove for any Iron Shot!
I haven't got round to fitting them on my new Driver and 3 wood yet but will do in next couple of weeks!
gripmaster leather, most tacky grips out there, you don't need a glove and they last a least 3 times longer than rubber. If you cannot stretch to them then Iomic grips are second best.