Time will tell, re; which Camaro model will be "tops".
Everything right now is
pure speculation. We need to sit tight and see what Chevrolet decides.
As for the past, Z v. SS debate;
You will get numerous opinions on which was the better Camaro. Alot depends on what the owner wanted out of their car. Yes. The Z/28 (with the 302) was considered the better handler, due to the lighter weight of the SB, but those who drove their Camaro's a 1/4 mi. at a time, the BB Camaro was better.
As for the amount of "numbers matching" Camaro's out there today, they
all are dwindling, regardless of whether its a Z/28 or an SS.
Again, the issue of which Camaro was better will never be answered by one person.