I have been investigating the same thing.
And have been looking at Wolf Tooth components rings. I contacted them with a similar question on 30t rings for XTR Trail & Race cranksets. As at that point was going down the XTR crank route. This was the reply
“It depends if you spend more time in the big or small cogs. For most people the 48mm is better because they spend more time in the big cogs. For your reference, 50mm is perfect for 1×10 and cog center lines are 4mm apart, so each is only 1/2 of a cog from perfect.”
The 48mm chainline refers to a 104bcd chainring as per the XTR Trail set.
So not sure if this can be related back to XT doubles and triples.