It's a pity the tooling is comparatively immature, with F# (or at least that was my experience last time I tried to develop with it). I think Rider is getting there, though.

To go into more detail, the initial implementation in Rider was limited to not much more than syntax highlighting. Inspections were fairly limited, ASP.NET MVC integration was not as featureful.

On the C# side, it's much more developed and refined. Within Rider, it's obviously been the main focus so I suppose it's only natural it's received more polish.