Wolves has 2 waves of 4, but.only the first one is strictly a 4 pack, so did you mean that one? Theyre both 1.0 bodies, anyways. Every wolf after is 2.0, I think, and the difference is slight and neither is superior to the other, so it depends on what you value more.
2.0 has a slightly better knee sculpt and slightly better ankle joint (and I really doean slightly). 2.0 arches the abs back better, but 1.0 crunches forward better. 2.0 shoulder is slightly better due to a hunting joint, while 1.0 just has an extending joint, but 2.0 also tends to pop the shoulder out more due to how the pauldron is attached, so 1.0 has a slightly better range to stick the arm out. Most 1.0 also have softer hand materials, which makes swapping and gripping better, but 2.0 has better wrist articulation and hand variety, arguably can swap easier, but grips is inferior due to the material being harder. 2.0 is slightly taller (whenever I said slightly, it's by a millimeter or single degree of a difference)
So in the end, unless one of these is a deal breaker, then it hardly matters and you shouldn't base your decision on this factor.