From a card design standpoint, this is captured with the creation of the Daybound/Nightbound mechanic on werewolves
As noted above, prices are expected to be a bit volatile for the first couple weeks following launch
I think that the Frenzy version is better against black-based midrange decks and ground-based creature decks, so I would say it is better against Rakdos Midrange, Mono White Humans and Rakdos Sacrifice
At the beginning of each upkeep, it returns up to two creatures with power 2 or less from your graveyard directly to the battlefield, then enhances them with +1/+1 counters
Granting them vigilance and unblockable is pretty good in these decks, so Pym Particles has a home
Both decks lean toward an Aggro playstyle, packing in 26 Creatures each (many of which are double-sided, using Innistrad's Day/Night switching mechanic)