We haven't ever had a Coachman so can't compare, but we are on our 2nd Rockwood/Flagstaff (they are twins). Moderate price, workmanship is fair, but we bought for the size and layout. So far we have not been unhappy with our 2nd trailer (the Rockwood); we did have some big issues with wheels/axles in the 1st one (probably the TT was too big for the axle ratings & should have had heavier-duty ones.)
Something that should be considered also is the dealer, especially if they have a local reputation. Those with reputation for fair dealing and especially good service are definitely worth dealing with, even if the trailer model is somewhat less preferable. Certainly true if all else is equal!