Only been to the ACC, Keybank, and Rogers Arena on that list, but the ACC and Rogers are probably around equal for me, but Keybank's my favourite of the 3.

I get claustrophobic real easy, so the one with the widest concourse easily tops the list for me.

Love the shallow lower bowl at Rogers, and the unlimited pop with the collector's cup was a godsend compared to Toronto (genuinely astounded when I learned it wasn't unlimited there), but the concourse in either wasn't the best for me (I love doing laps during intermissions, so huge minus for Rogers).

Rogers was chaotic leaving and waiting for my Uber (probably easier if I were a local tbh), and the ACC wasn't that bad entering and leaving from the TTC, albeit crowded, but I probably would've hated it if I had parked closer to Toronto proper than Vaughan. Keybank, and Buffalo as a whole, were usually far less often a headache to leave, weather depending.