AelisMikilai, it seems to me that triangle areas are worse. Usually I try to keep everyting quads (i.e. four vertex polys). I'm no master but I have read from others who are good with modeling that it's particularly good idea with subsurf (or any kind of SDS) to use quads.

But back to your pic, you can try to improve smoothing by setting Auto Smooth and playing with degrees (Deg:) setting. it only affects rendered pic, if I understand correctly.