I think many of the brands are similar--- all the appliances, etc are made by the same companies (Norcold, Dometic, Duetherm, etc). The absolute most important is the condition (a Mercedes not cared for is not as good of a buy as a Chevrolet well cared for and maintained).
We have a 1998 Coachmen Leprechaun which we purchased in 1998. It was well cared for-- we are very happy with the model and its features--- It appears (based on the features and amenities) that Leprachan was higher end for Coachmen-- Coachmen brand appears to be mid level with alot of experience/history. Good luck-- again focus on condition.