I use Fusion 360 for some filleting… I have T-Splines for Rhino but Fusion makes a nice addition as a tool. It’s great to export meshes if you’re having problems but it’s not always straight forward… Worth a play around with but I bet my bottom dollar you stick with Rhino.
I also use Meshmixer which is pretty handy. I tried Sculptis but found it lacking, Meshmixer is good fun and easy you use. Working with a tablet for this kind of work is a pleasure.
Andy