I’m not on Ubuntu but using Wayland on nixos. Fractional scaling does not look or work well at all in my experience. I decided on 1.0 scaling and pushed it all over to font sizing (around 1.5). This works pretty well for most apps but it is a little small sometimes. The biggest issue is having to manually scale up some apps that don’t keep my preferences.
Gnome's accessibility feature "larger text" works a bit better than font scaling IMEx. With font scaling often some alignment and spacing seems odd. And you can toggle "larger text" with one click, if you make the accessibility menu permanent.
