I’d say Ocean Beach is a great place to foil. It can be top to bottom and fast, extremely difficult to prone foil on certain days/tides. With good SUPfoil technique and especially with a foil drive you can get the swell out before its breaking.
Finally, it is a really long stretch of sand, and you can always find a place to go where you are clear of surfers.
However, it can get big, and even on the medium size days caution is strongly suggested. A few days a year it can be as heavy as anywhere in the world. I’ve paddled out a few times just to be out there on a day like that when school-bus sized barrels are coming through a quarter mile out to sea. Wow!