I'm quite honest: Have been a huge football (European version) fan for most of my childhood and teenager days, but I've switched over to American football as quite a lot of my friends have, too.
Mind you, we are all active footballers (European version) in amateur clubs.
Reason for this is that professional football in Europe has become an unwatchable, unfair mess and playball of some corrupt states/oligarchs.
Year in and year out the same teams win their respective leagues and compete for the UCL, while non-elite clubs can work as good as they can, they don't even have a fair chance to reach that status.
Who tf cares for those domestic leagues? PSG wins it all the time in France, Real/Barca in Spain (with Atletico occasionally saying hi), Bayern in Germany and Juve/Inter in Italy. Only interesting one is the PL and it's full of shit owners.
In the NFL you also have owners, but the system is a lot better. Draft and salary cap alone create a really competitive atmosphere, where each of the 32 teams has the chance to turn things around in a year or two, if they work smart. On top of that the playoff system is fire, too.