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If you don't mind spending the extra $40, go for the bigger one and under gain it, affords you opportunities/flexibility to potentially reuse it in another car/application someday too potentially.
Also, I looked at the XD amps before going with the Alpine, they are nice and very small form factor, the Alpine is slightly larger physically. I have mine tucked under the trunk floor on the opposite side of where the factory amp goes, same side as the sub itself, it fits there very nicely admittedly, but if you were thinking of mounting the amp somewhere where it has open access to air (better cooling) then smaller is typically nicer.
Edit: if you do buy the larger one, make sure to tell your installer that you want them to use a DMM (digital MultiMeter) to under gain it. 400W RMS is what the speaker is rated for, 300 is recommended, you can go above that too depending on your settings. I have mine setup for 400W@ 75% vol on my HU using a 0db 60hz test tone. TBH this is slightly conservative, almost nothing music wise will actually play that way, but it suits my needs very well.
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