I'm generally not a fan of putting Power Fists (or other Unwieldy weapons for that matter) on Space Marine Captains or Chapter Masters. Sure they have high WS, multiple wounds, and a built in Invulnerable save to keep them alive long enough to use the thing. But the Unwieldy rule nullifies their Initiative of 5, which is a nice advantage to have when facing other Marinelike things. I prefer taking things like Relic Blades for them as they have high Strength, good AP, and they still get to strike at I 5. But the new web only Captain and the double secret web Captain both come with Power Fists. I like the looks of them but am not too keen on the PFs.
Is there some advantage to taking PFs on the characters I've overlooked? Or are these new models just made more for looks than game effectiveness?