Onshape is in its infancy but has great potential. Still limited in what you can make surface-wise.
F360 had me very excited following Autodesk University last year - it was cool to see that a couple of design firms were starting to use it, most notably Industry PDX for that titanium bike concept. I like almost everything about F360 - the multiple platforms, low prices, stable backing by a big company, well-thought out interfaces. The t-splines surface modeling concept makes sense as well, at least theoretically. The biggest problem with F360 is there’s no installed user base and so they are going to have to slug it out seat-by-seat with Dassault, for the hearts and minds of SolidWorks users.
Surfacing in SolidWorks is like being a dentist and pulling teeth using a dull butter knife and a roll of toilet paper.