msf-- had BTHR on April 1, 2009 so, if you like, you can check my recovery process to see what one person's recovery is like. I also had MOM, and an anterior approach. I requested MOM based upon discussions with OS friends of mine and my surgeon. My OS does all kinds and agreed to do it for me. Jo will probably tell you this, but in hindsight, I think that material choice is one of the less significant choices and one in which you should discuss with your OS.
This was a first-time surgery for me so I don't know how revision surgery affects the decision, but as for 2 at once, assuming you need both, I would not do it any other way. Even though it sounds like a big deal, the truth is that bilateral surgery is not 2x as hard a single surgery. Rather it is about 10-20% harder, I would guess. As for my hospital post-op recovery, my hospital basically gave me an extra 12 hours to rest after surgery before getting me up. For singly hip anterior surgeries without complications, the PT staff got people on the afternoon after the morning surgery. for me, a bilat, they let me rest in the afternoon and got me up the next morning. So I basically was one work shift behind single hip recovery patients. If you will be weight bearing after surgery, and this may not be the case for a revision, then bilateral surgery, I suggest will be much easier.
Make sure you get a surgeon who is experienced with bilats. Jo suggests that bilateral surgery is common. I'm not sure how true that is here in the good ole' US of A. I had to travel a bit to find my guy, but it was well worth the trip.