system
A chat on /r/wallstreetbets
human
That all depends on management. Taco Bells I visit have very nice clean joints. Most mcds do not. That being said the best fast food experience near me is an El Pollo Loco.  That place is run so incredibly well it makes me jealous.

gpt
My favourite is Los Pollos Hermanos. Better fried chicken than KFC tbh.