Not the person you asked, but wanted to offer my 2 cents.
So you want rolling release, with lots of software installed and it should not break.
- openSUSE Tumbleweed indeed seems like a logical fit.
- If you're fine with smaller projects, you could perhaps also consider
- Garuda Linux: Arch-based with Btrfs snapshots and Snapper; similar to what openSUSE Tumbleweed utilizes
- Siduction/SpiralLinux: both based on Debian's rolling release; also with Btrfs snapshots and Snapper
- If you're okay with 'immutable' distros, consider the following
- Fedora Atomic: current gold standard; the uBlue images specifically allow a very smooth transition
- NixOS: more 'powerful' than Fedora Atomic, but ridiculous learning curve
- blendOS: Arch-based. Small community and has only recently left alpha phase