That's a tough one.
I have a pair of the 2200's and I really like them but I have had a problem with them humming.
I even ran them through a CI Audio humbuster but really didn't have any effect on the humming.
It really isn't that bad so I live with it.
The reviews of the XPA-2's that I have read have been very positive, lots of clean power.
I would really like to try one but where I have the 2200's I could not put anything any larger so there is no chance for now.
One thing to consider is to buy both and give them an in home trial for the 30 days and see which you like best.
That is a lot of money to be tied up but then you can really find out which setup is best for you.
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Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for center and surrounds
2- Emotiva XPA-1Ls for LF/RF duty
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Lore monitors L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center