Well actually for either one your strength gain isn't going to do much for a powerlifter, you would better of with a serious dose of test, tren, deca than anything you would get from the IGF or GH especailly for the money you are going to shell out for the IGF or GH. GH and IGF are for extremely lean muscle mass gain even though you get hyperlasia either of these compounds are not know for strenght gains, well atleast as far as I know and I don't know it all. Hope this helps...