FX BOSS OR DAYSTATE WOLVERINE R ?

Wait and see the reviews of the wolverine R if you can muster the patience. Nobody here can give you a real idea of what it's like because nobody has one yet.
Comparisons with the standard wolverine is basically like recommending the Boss because I have and like an unregulated Royale. Probably quite close but not actually a true reflection of the gun you're thinking of buying.
I've only seen one review of the R so far by Alvaro from suncity airguns, but that wasn't the 0.30. Think it was the 0.22. Was still impressive though, on a very windy day.