We did an analysis among the BC, BH, and Landmark (these are all built on the same line). Here are some of our findings - I'm sure others have more and will chime in.
Landmark specs indicate some greater insulation and some of the BH options are standard on the Landmark. Ditto between BC and BH. Cabinets appear to be the same as the BH and BC per the design center. BH and Landmark now have solid surface range cover (prior Landmark only had this).
Landmark has the Whisper Quiet AC system - AC units are hidden whereas the BH and BC have integrated AC units (frankly I'd rather see them and have the access to them - we've had to have work done on both of our new ACs and I'd rather have the cold dump feature too). Per those that own new Landmarks, the Whisper Quiet is not that quiet. The ducting otherwise is the same per Heartland.
In regard to furniture, BH and Landmark is very close if not the same. BC does not have the top stitching and the BC sofa bed is a fold out rather than the roll-over air bed that the BH and Landmark has.
The BH has window-paned mirrored closets. BC is plain (I like better for cleaning frankly). The Landmark has cedar lined closet
Landmark has a DVD/Sound system in the bedroom. BC has speakers in the bedroom; BH does not.
Landmark has a nicer kitchen sink layout and a tall faucet.
Landmark has frameless windows and comes with G rated Goodyear tires (BC and BH have E tires)
BC has one-up on the BH and Landmark with the new Atwood water heater that provides 20 gallons in an hour. BC and Landmark have 80 amp converters. BH (per current spec) has a 65 amp converter.
Best bet is to go to the Heartland RV site and compare specs and review specs as well as see them in person. However, just because a standard is not listed does not mean it's not included - for example, the BC standards do not state that the AC is inegrated nor do they state that the shower has a 12V water proof light (really like that) - this caused us to have to ask the dealer many questions about what the actual standards were in the BC. Also, much of the differences can be ordered. We did this when we ordered the BC - we liked the BC model and exterior color but we added/changed to all the BH standards/options that we wanted that were not included in the BC (e.g., individual hydraulic valves, rubber mat in basement area, smart light, regular in lieu of vessel sink). We liked the BH vinyl better and ordered that and we ordered the BH sofa (which is very close to the Landmark's) and it was approved until it went to engineering when it was found that the rear area in the BC was not deep enough to handle the BH roll-over sofa bed in lieu of the fold out.
Best of luck. Hope this helps.