I’m satisfied with my Formbot Trident kit. Looks like they have addressed most of the shortcomings I felt my kit had when I purchased it about 6 months ago. If you go with it you may want to pick up spare hotend and part cooling fans as the ones shipped with it are pretty poor quality. My hotend fan didn’t even last a month.
ModernUI was abandoned afik. FreeCAD Ribbon UI seems to have taken its place.
https://github.com/geolta/FreeCAD-Ribbon