Personally I always prefer to use the rpm when it is available. Others prefer the flatpak.
The only way to be sure you are happy is to either choose to always use one and be satisfied, or try one then the other and see what works out for you. Each of us makes our own choices.
Our preferences may not match your likes so we cannot do anything more than tell you what we prefer (and sometimes why, but it seems the whys are not often given).