I think Arsenal's league win in 91 when they got docked 2 points and still won it, with loads of 1-0's, and Tony Adams going to prison halfway through the season is better than the invincible one. They got docked 2 points for scrapping at OT.
Also they've won it at Spurs, and obvs with the Michael Thomas thing. I'd say those moments would make them seasons the more memorable, but who am I to judge? They've had some good ones anyway, fair does.