It was between the XR 16 and M2 for me while getting fit. Numbers and distance were very similar, but the misses with the XR were left bad. M2 misses were still straight-ish or a fade.
That's my experience but I will say when I nut one with XR16 it's pretty fun, just have to watch out for that occasional wide left which is not my ballflight yet prevalent in all of the recent Callaway releases over the past 3 years.