Comparison of OCLL and CLS

I'm trying to determine if using CLS during step 4b during bad cases, actually yields a lower move count if I turn it into a CLS case, instead of fixing it and doing oll. Just for ease of comparison I will use the following case:

R U2 R' U R U' R' U

The inverse would be my solution to solve this case normally, but turning it into a CLS case makes the solution merely

R U R'

This is 5 saved moves, but I'm wondering if it really is 5 saved moves.

I can calculate the average move counts for both oll and CLS, but I cannot factor in which cases occur most often, and give an actual average move count for oll or cls. Can anyone help me?