Best on the field football: the 1990's. The rules on holding and interference weren't so onerous then. It was the era of a "balanced run and passing attack," which I find more interesting than the pass happy NFL, facilitated by fussy holding/interference rules that often times seem arbitrary and poorly enforced.
(OTH, the freakish speed and athleticism of today's players is amazing and fun to watch)
Best off the field football fan experience: the last 10 years. Social media (message boards, twitter, et al.) make much more information available, faster info emergence, and access to multiple opinions and interpretations of it.
Corollary to today's fan experience: it's 1985 your source of information are the beat reporters of the one newspaper and maybe a few television/radio stations. The analysis and discussion you have with the limited information is with the same two winos you see every night at Al's Gin Mill in Lackawanna.