Okay, I'm principally thinking in terms of Polystar Energy; but also, just in general, what's the common understanding? 16g, 17g, 18g... Which offers more power and spin? Which is for durability and lasts longer? Which is for feel and touch? Basically, I think I might be a bit muddled in my thinking here. Therefore could people please possibly help clear this up for me... How are they different?... what qualities does each represent?... Thanks in advance, R.