African blue basil hands down. It’s a sterile hybrid so produces no pollen nor seed; it focuses all its growth into producing flowers. Lots of flowers. So it flowers 24/7, 365 days a year as long as it doesn’t get frozen back. (It can’t take frost) Over time it can turn into a large bush that absolutely hums with pollinators all day long. So long as it gets direct sunlight, it produces copious amounts of nectar all day and that’s why it’s so popular with insects. Since there are no seeds it must be propagated through rooted cuttings, but they root so easily in pure water it’s never an issue. A small bush will provide you with all the cuttings and possible plants you’d ever want.
Basil downy mildew is all over Florida now, and it thrives in warm humid conditions. It pretty much makes growing regular basil varieties impossible long term. African blue basil gets it but it barely cares and just keeps trucking.