Witch doc will have a lot of fun viable different builds.
Wiz will be pretty quick but will almost certainly get boring after a fast than others.
Dh is meh, same builds are best, few new fun less effective ones but they dont get much from cube.
Sader is hit hard this patch, with sweep attacking besting the new set for high tier gr's, its not looking good (ehp major issue).
monk/barb op ofc, barb having like 8 possible effective builds, monk having like 3-4.
I vote start on barb till you have a gg group with mats for days, then move to wd.
This is what i will do.