Hands down two different worlds. Regular AP is trash comparatively.
Seconded. Sort of.
FSD on two-lane roads
with stripes isn't half bad. Without, it's your life in your hands. Will handle stop lights, sort of, but not very well. Stop signs, well, forget it.
FSD-b is
better on two lane roads
with stripes. It'll do a much better job slowing down on curves. It won't come to a screeching halt when somebody turns onto the road, or crosses it in front of somebody and, if it has to slow down under those circumstances, does a better job. Not human style, with an eye to missing cleanly, but better. With jerks. Will handle stop lights much better, but does a rotten job (at this time) picking lanes to go straight ahead/right/left upon. It'll get through right turns in one piece, but, at this time, left turns are a crap shoot that it fouls up on maybe 60%, 75% of the time. And it's very jerky with those.
If I wasn't testing FSD-b and was interested in getting to destinations with decent blood pressure, it'd be the current release of FSD, hands down. On
particular roads (out in the country, not much traffic, not much traffic signs/signals), FSD-b is better, no question. But one won't know if one has one of those kinds of roads until one tries. And if it's all like that.. FSD is adequate. Probably not super, but adequate.