If hogs are what you are after, and you typically are hunting groups/sounder of hogs at a time where you will plan to have follow up shots, the XPs would suite the needs of most people better than the XMs.
I shoot with a Flir PTS536 thermal, and it has a 4.5 x 3.5 FOV, so just a bit wider than the XM50 and I could shoot hogs with it but we don't have them in ND. I shot a quad, a few triples, and lots and lots of doubles coyote hunting with it. It is harder to find the 2nd, 3rd, 4th target, but it can be done, and the mag is nice once they are in scope. With the PIP feature of Pulsar scopes, you can get by with a wider FOV in comparison to other brands because you can always have PIP on and still be useful for longer shots.
On the flip side, you could get an XM30 and almost a scanner for the price of the XP50, so it really depends a lot on budget. I would give Tom at Night Goggles a shout as he can provide more information on hog hunting and thermals. 909-312-5424 X531