Re: Frenzy, Sword or axe mastery?
My pure Frenzy is always an axeman. I even planned the 1.10 around alternate gear for summoning and didn't need any additional IAS. Beast ettin axe, Crescent Moon war spike (takes care of the Schaeffers/Stormlash issue), Wolfhowl, Stone, Death ethereal war spike, Oath ethereal ettin axe, and so on.
I have a two-fister with a variant using Whirlwind, and that's not wise to use a Beast in an ettin axe since the last breakpoint isn't possible. Rather than make another Beast I prefer to use swords, so there's a possibility for you. Of course, you could just use a eBotD berserker axe, but then a colossus blade is just as viable (if I remember the list correctly).
I suppose it really depends on the runewords you're going to use.