Shadcn or Mantine as base for solo startup project? If Shadcn, is it worth (if so, which one) to buy a premium UI kit built on Tailwind for solo startup project?

Hi, I am technical cofounder of a startup. I am full stack but much more backend focused, so I want to focus on real value of the core product rather than spending lot of time on creating UI elements which is not my main strength. We picked up shadcn as we like it in general, but o am still a bit in doubt (not too late yet to switch) if Mantine isn’t more complete solution and maybe for this situation would serve us better?

There will be quite some public space for B2C part and also quite some “admin panel” for B2B part, but focused in simplicity of use.

I will appreciate your help on this!