Personally I liked being able to rotate the object with one hand, it's a bit inconvenient to have to hold down another button every time.

I like sketchfab's 3D viewing controls.
Left click: rotate
Right click/middle click: pan
scroll wheel: zoom

I hope the more ways to pan and rotate the camera ...

In Cubik PRO, I could see flat planes from above, that made it easier to arrange them the way I wanted.
http://i.imgur.com/OCN0KjZ.jpg
Now they are invisible from the top and sides so I have to figure out their position from the perspective view.
http://i.imgur.com/nyKEZdQ.jpg
Just a one pixel ...

you can also rotate with CTRL + middle click.