Mint or Pop_OS are likely the most widely recommended distros I know of for beginners. I haven’t tried either of them myself, but from what I hear about them I’m inclined to agree. Personally I would NOT recommend a rolling release distro to beginners. Too much potential to break things way too easily and way too often, which would likely require digging into the terminal to fix. Terminal-averse beginners wouldn’t be served well by that at all.
I personally vastly prefer mutable distros for my own system, but I understand the appeal for those who like them. As long as mutable distros remain an option I don’t mind immutable distros.