I have stayed in many dedicated vs lockoffs. Can't speak for BLT, but unless you purposely try to look for differences, you don't notice many functional differences. Yes, if you have a lockoff you get the extra door and kitchenette in the 'extra' bedroom and but chances are you won't need to use it if you have a full kitchen a short distance away. I guess the only thing to watch for would be that if you have kids sleeping in the attached studio of the lockoff, there is a chance they could exit the entry door. Depending on their height you could mitigate that by ensuring the latch is set to the lock position above the doorknob.
If there is any difference in space between the extra bedroom in a dedicated vs the attached studio, I certainly did not notice it. Same with bathrooms.