I'm interested in black-and-white vintage porn, gay or straight, from decades (and decades) past.
For current porn I appreciate 1080 or sometimes 4K uploads, and keep external hard drives to accommodate their space needs.
It's possible to have wide-ranging temporal tastes in porn, and I do.
The period in the middle you describe, including early color -- a lot depends on how well the clip/film has been preserved.
In any event, don't be discouraged by any boo-birds who comment on a particular vintage upload. Do your thing!