Showplanes
I went with the showplanes cowl and never looked back...
Personal preference, really, but here is why:
I like the looks better, can't stand the snorkel.
I have CAI. I do not know if it fits in the stock cowl.
I did a split lower cowl, which was fairly easy to do on the showplanes cowl.
Having flow with it now for 50 hours, I have not had any cooling issues, and removing the split cowl is incredibly easy.
Can't say how much more or less work is involved as I obviously did not use the stock cowl. I would guess a bit more, as there are some baffle mods that need to be done for the inlets and induction system.