If you use a thick handle..I feel that you have basically wasted a lot of your money. There are so many ways to train the grip...that I just can't see spending much money or time on making a set with a thicker than standard handle.
The smaller handle will work the grip a lot (and in a totally different way than a thick handle, in a BETTER way I believe) and you have A LOT more weight on them which works your entire back side of your body.
B True