A higher LSA will give you a more stock like idle. A lower one will give you a choppy idle. Lower LSA also give a peaky power curve, where as a higher LSA typically gives a more flat/gradual power curve.

YouTube - 4.8 silverado cam 110 lsa aka low LSA

YouTube - GTO LS2 gt2-3 cam aka higher LSA 117-118.5 I think.