Autopilot is great. It does the boring repetitive parts of driving. It behaves predictably in response to stimuli, and generally errs on the side of caution. This causes it to be suboptimal in ways that the driver can account for. As an example: when making lane changes, Autopilot is very sluggish, to the point that if there's any traffic at all, you have to give it a kick on the accelerator to complete the move.
FSD is a trashfire. I'd say the closest description is like you're constantly supervising a 15 year old learning to drive for the first time. Where I live, it'll disregard no-right-on-red and creep past stop lines that are set back from a light. It'll try to take turns and then lose track of which lane it wanted. The cognitive load of babysitting FSD is worse than just doing the driving myself.