alright in starting strenght he recomend with squat you use a thumbless grip and straight wrists the straight wrists is fine but the thumbless hurts my wrists could i use the thumb grip?

and bench he recomends you dont bend the wrist at all
jut like this pic
http://stronglifts.com/images/bench-...rists-grip.jpg
i feel better doing the 1st one but i know that it is wrong and i cant do as much weight. how come?