A-body trade for a B-body???

I think I know how this is going to end up. Anyway here it goes. I have a guy who wants to trade my 70 Duster for his 72 sattlelite [spelling?] Both of our cars are very nice. My car is badged as a 340 clone and his is badged as a roadrunner. I have two other a-bodies in the stable. I thought something different might be in order. Do you think they are similar in value? I dont want to post his picture without his permission. But anyway. His car has a 400 basically stock look with bucket seats and column shift. It has ralley wheels and new paint ect. Very nice ride. I have never owned a B-body before. This car is kind of odd looking. But it is growing on me. Which one will likely hold its value? His is #s matching mine is not.