Best diesel pusher chassis ?

Between Spartan and Freightliner, there was a time when the Spartan was optional on some coaches and never knew one to not have a side radiator, whereas most all the FL's had a rear radiator and were mainly found on entry and mid entry level coaches.
Nowadays, it seems that FL has the better chassis available as well, so most sure, there's not much of a difference.
Foretravel has partnered with Spartan in recent years, if that might tell you anything.... Foretravel and Spartan