I assume from your email this is in business class. The 767 is the worst CW cabin (and the best WTP cabin, especially if it's a refurb), however you know what you're getting. The A321, I believe, may be mid-haul with 1-2-1 lie-flat beds in CW, or the old BMI business seats.

I recommend getting the train into Moscow from DME, rather than a taxi.