Okay, full size lathe. If money isn't a barrier, I'd get the Vicmarc. The up side, is that everything I've read says it will take the lesser expensive Grizzly jaws. But the Oneway Stronghold is another favorite of folks with big lathes. But they aren't cheap! Many people like the SuperNova. I have a PM 3520B and tried 2 of these only to return them both. I couldn't get either to run true. I currently run a Barracuda 4 because I could get it fast. Unlike the 2 Supernovas before it, it does run true.
All that said, my next chuck will be a Vicmarc. I saw a video today and the turner showed his collection of jaws for it. More than any other chuck on the market, but that may include the Grizzly jaws.