I'm AT All West on CUR as I write this, 6 days into a 10 day dive trip. We're having fun driving our diesel pickup all over the place and try to line up a 2nd shore dive site with a good beach cafe for lunch, something you don't usually find on BON, unless you're diving a resort's house reef.
One often does more WORK shore-diving on CUR due to many steps down to the water, similar to 1000 Steps on BON. And the swims out to the drop-off tend to be longer.
So to answer the OP, I'd say that BON has easier shore dives. But I like both places...