which chassis was the best ?

[zenith2134]

Yes, most import TVs in the vintage era were generic workhorses, lacking character. There are a number of exceptions to this of course.
My opinion, which I'm entitled to.

I don't collect old TVs to use as reference monitors in an editing lab. A little blooming or less-than perfect convergence is not a major criteria for me when collecting old color sets. I have modern stuff for that (CRTs but with tighter tolerances for performance).