Both are horrible and will crash and you will never finish your project. Just use Resolve and get work done.
I tested a few such as openshot, flowblade, ... about 10 months ago.
flowblade has the best UI IMHO (more streamlined), but it was annoyingly restrictive for quick edits such as opening a clip, apply just a trim and maybe add 1 filter (usually crop).
It also wasn't very stable.
I ended up with shotcut for most of my needs. It's very flexible and has a good balance in ui/features: intuitive enough that I had to spend zero time learning it, yet has more than what I will ever need. Although it's not as smooth performance-wise as flowblade. It never crashed on me yet.
I didn't like the UI of openshot, but this is a subjective thing. Felt space-wasting and oversimplified, which might be a plus to some. It also did crash a lot for me.
I use avidemux a lot for cuts. It's the fastest editor for this by FAR. UI is minimal. I would say underrated, although it's a pretty well-known tool, just in a different class (not a NLE).
I was a big fan of "cinelerra" some years ago. It's blazingly fast, but very restrictive in the formats it accepts, which is why I stopped using it. I mostly cut random videos coming from random cameras/phones/etc, so I value free-form over standardized workflows.
Don't forget Blender. For some more complex stuff, I successfully used blender's NLE to track/mask clips. Worked perfectly, absolutely stable even for complex videos, although it needed slight more RTFM than the other options and noticeably heaver in terms of system requirements.
Not being used to the concepts of video editing, I found it easy to find a workflow that worked for me (cutting out mistakes and stitching remaining ends).
I ended up using Windows and had a just barely usable system. I had a lot of problems with poor scrubbing performance and renders that sometimes had black frames randomly in them that I fixed by converting everything to prores (and blowing up into huge files).
My long term fix was to get a mac, where it runs flawlessly with basically no effort. It's a great tool, but there are some pitfalls.
https://github.com/fat-tire/resolve
.. allows one to execute Resolve in a container (Docker AND Podman)... and now Linux is my go-to env for running Resolve. Just being able to run N+1 versions of Resolve on the same workstation is a lifesaver.