Cyclist75354986865

Okay, I know this subject is all over the forum but I really need some help. I have been fit by two different fitter's in the last two years. The last was done with Dartfish and Retul, just wanted to try out the new technology. I was looking for a little more power while climbing and doing long distances. While I have almost identical reach with both fits they are quite different. The new fit raised my saddle by 2cm and moved it forward. The reach is within a half of a cm from the previous fit. I can't really tell any change in power or comfort. My question is what is the advantage of a higher more forward position versus a lower more stretched out position?