Choose a van

We are currently on van number eight in 35 years caravanning.

First van a10 foot Monza four berth. Selection criteria price. Second a Perle bought because it had a loo room but no loo. Next a Swift bought on a whim when purchasing tap.

Currently a coachman, bought for its' fixed bed instead of a large end washroom.

What criteria have you used in selecting a van? And what have been good and bad choices?