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Debian testing might work. I don't know if it is technically a rolling release distro but it stays up to date. Also OpenSuse tumbleweed. And there's a similar Fedora distro: rawhide, maybe?

Why use testing instead of unstable? (genuine question)

I don't really know, I haven't seriously used unstable. That being said, I like testing because the packages are generally new enough for my purposes but they've also had more vetting, so I don't have to worry about a broken system as much.

I'm curious why you think Arch is not user friendly? It's not the rolling release since you're asking for other distributions that use that model. I've used my fair share and from what I've seen Arch is by far the most user friendly.

User friendly in terms of I don't have to read documentation or learn anything to install it. Like windows or OSX.

I'm sure Arch for what it is trying to be is user friendly in that sense, but it's not what I'm looking for right now.

I've been using Linux Mint, Debian Edition, for years now. It's rolling.