In my case the writing style is more important than the art...assuming artwork reaches an acceptable level. Given that bias...a lot of the 60’s stories just seem a bit too one dimensional/ lacking nuance. Always exceptions, of course!
In general...there’s such a wealth of wonderful old material, that I’m always surprised that newcomers often effectively get advised to concentrate on stuff being produced currently.
I can’t think of many genres where the standard advice wouldn’t be to sample fairly widely from different eras, find the style, writers (and artists) you enjoy most and take it from there.