I love bezels it’s really protective and you don’t need a spacer. I also love single shared prong ring like the one shown, however I caution that if the diamonds extend past the metal then you really need a spacer otherwise that diamond girdle will eat up your solitaire.
Both rings you linked are beautiful, I see why you’re torn. Mine aren’t rounds but I thought you might get the basic idea. Hopefully someone will post photos of rounds for you!