Simple enough extra frosty and more trichomes does not gaurantee it being more potant. I recently grew out a seedling that ended up being SUPER frosty, maybe more then my normal keepers. HOWEVER it also produced ZERO smell and taste(which is weird) and not an impressive high. It was definitely fully matured and I've still got a few clones of it finishing up, so we will see how this batch is. But I've planed to let it go after these clones because even though its frosty and looks dank, it is not.
Then on the flip side of that you have sativas. I've grown a few, and seen others that frankly don't have massive trichomes and crazy obvious frost(its there but the trichs are smaller). And those sativas would rock your world.
I think what is in the trichomes is far more important than how many trichs exist, and what's in them varies by strain and phenotype.