The best clowns for beginners are always the captive bred of any species. These are just hardier IMO. The "more difficult" clowns are usually just because they need their anemone to be safe and some tanks are not suited for the larger anemones these demand. At least FME. I have kept successfully over 5 different species of clown. No issues with any. I do know from others that the maroon and tomato tend to get larger in size and can be quite aggressive. Then again, most clowns are.
You can certainly keep a maroon without the anemone and many are captive bred. So a plus. The tomato I would think would rather have a nem, but okay without. These are captive bred also, just harder to find.
Good luck!