Yeah, that's part of the conundrum.
PF01s are indeed 2 lb. heavier per 17x8.5 front, 3 lb. heavier per 18x9.5 rear. +10 lb. of unsprung/rotational mass, ohnoes!
Lookswise, I used to be dead-set against any 6 or 8-spoked wheels with 5 lugs, and in general I much prefer an odd number of spokes (PF01 qualifies as 2x5-spokes).
But the RPF1 has a slightly more utilitarian, form-follows-function, "race car" look to it. And I like the fact that the spoke design and smaller-diameter dropped center makes them look smaller in diameter.
Purely aesthetically speaking, though, PF01s do look nicer.