heres tips for GenX:
If a morph says something about HD then you usually want to use edges.
If a morph touches fingers/toes they may end up butchered if so retry with the smooth option.
If you find some morphs seem todo nothing at all then you may need to reconvert them with edges option.
My experience comes from trying to convert the morphs from PH11050PH3r5366 to G8M