OnShape is much easier to learn than F360, IMO but if you already know SU and are not having problems with it, it is probably not worth switching just for the sake of switching.  OnShape has some great tutorials/lesson that made it very quick to learn.  At the end of each lesson, you can download a hands on exercise that drives that lessons topics home.  very well done.  I started using it mostly because SU is terrible for 3D printing and not great for CNC either.  For the work that you do Bentlyj and your familiarity with it, it may not save you any time.  One nice thing about OnShape is that it is free as long you do not mind your designs being stored in the cloud and public.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.