The scenario is that my Chaos Lord and a smallish number of Berzerkers (say, 5, one of whom is a Skull Champion) are piled into a Rhino APC to rush across the battlefield, pile out under cover of smoke grenades and supporting firepower and then run at a charge, howling for blood to be spilt and frothing at the mouth with maniacal anticipation.
All things working out as planned, so the Berzerkers have Furious Charge with a bonus to Init. and Str. and an additional Attack for initiating the assault. The Chaos Lord does his bloodletting, but let's assume that there are more than enough warm bodies with pulses still standing for the Berzerkers to have their fun.
Now if I'm understanding correctly, if the Skull Champion had a Power Weapon he would get all his attacks at a slightly higher Init. the first Assault turn, get a bonus Attack for the pistol in his off hand, an extra attack for the charge, and any hits would ignore enemy armor saves. A lot of potential hits at better-than-MEQ Initiative, in other words.
If I tooled out the Skull Champion with a Power Fist, however, he would attack with a 10 Str, get an extra attack for the charge, and cause
Instant Death to MEQ's. The down side is that in current 5th Ed. rules he wouldn't get an off-hand weapon attack unless he had another Power Fist, a Lightning Claw, or something similar. Oh, and he'd strike dead last in Initiative order with all his Power Fist attacks - there's not much point in saying he'd use his Bolt Pistol for all his carnage just for
the sake of running with a higher Init. since that kinda defeats the whole point of having him assigned a Power Fist, you can't split Assault attacks between weapons rules-wise, and the Fist is so much more intimidating.
With only 5 Berzerkers and a worst-case scenario, the unit might all be dead before the Champion is even able to get medieval on the squad's intended victims with his Fist. Myself (being an absolute novice player), I think it would make more sense to have as many attacks at as high an Init. as possible and be able to cut through armor like butter. Judging from what I've read on various 40K-related forums, the majority opinion favors Power Fists versus Power Weapons.
What do you folks think? I'm wondering what would be better for my small CSM force-in-progress. So far as modelling, I've got either extra-killy Power "stuff" option covered with a planned conversion for my Skull Champion.