>>96740020
Saturn 4U and 3U are about the same in print quality, but the 4U has some improvements that came with slightly less build height. The Saturn 4 basic has the worst of them both, that's why when people do not want to take the risk with the tilt mechanism they default to the S3U.

The mars is smaller, for not that much less money, so for most people it is a nice beginner size that tends to quickly get restrictive. Same story between the 5U and the 4U, just one number higher.