Class(es) that get most/least mileage from BiS

[zodium]

I have no frame of reference for other classes, so I can't tell if it's the most, but the power difference between your average compost green-armored pushover and a proper purple, fully clickied up Druid is so vast--both in terms of encounters that can be attempted or meaningfully contributed to, and how much can be contributed--that they may as well be different classes.