I made that same switch about 25 years ago and haven't looked back.
Advantages to Arca Swiss that come to mind:
- Much wider base of standardized accessories like: L-Brackets, Long Lens Plates, Custom Fit Camera Plates, Macro Rails, Nodal Slides, Pano Bases, etc.
- Much wider array of matching commercial offerings in things like: Ballheads, Gimbal Heads, etc.
- Ability to adjust balance point on things like long lenses by sliding the Arca Swiss plate forwards or backwards
- Same ability to slide fore and aft makes for a very handy macro focusing rail if you don't need the precision of a geared slide
- Ability to mix and match components using the Arca Swiss sytem like: slapping a Wimberley SideKick or equivalent on an Arca Swiss equipped Ballhead for a quick and fast gimbal mount, ability to add an Arca Swiss Nodal Slide to a full Wimberley gimbal head when you want to mount a camera directly but are running a full gimbal in the field, ability to easily clamp flash brackets right to Arca Swiss long lens plates, etc.
I just find the Arca Swiss system (regardless of vendor) very flexible and useful in many shooting situations in ways square plates like my Manfrotto plates were not.