Quoted: Using the seat of the pants test the XM 193 feels a little hotter. Either that or the Q3131A has more of a flash retardant which makes it seem a little more civilized when shot from a 14 /12" barrel.
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My experience has been, flash supressant levels vary from lot to lot in Q3131A
and XM193. Some lots have a lot, some have none at all. This is perceived. The only way to judge "hotness" is truly with a chrony.
Out of your 20" barrel you won't see a difference. I picked up 5k of Q3131A from KY imports and I am quite happy with it. The only reason I lean toward the XM193 is I have fired thousands of rounds out of four AR's and all have functioned perfectly. May I add one of the ARs is very fussy but shoots XM193 flawlessly. I don't think you can go wrong with either. Good luck.
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Always good to find what shoot best in your rifle, and go with it. However, since lots can vary, even that is difficult.