Orbital buffers will require more work and rubbing in than a rotary buffer. I would only use an orbital on cars that arent in that bad of a shape. I wouldnt go using a rotary buffer on a car that doesnt need it. Just doesnt make sense to. Start with the least abrasive way first and work your way up. Its almost impossible to ruin paint with an orbital. I would definately get one to get you started. Every detail shop that ive been to has orbitals and rotary buffers and there is a reason (mentioned above.)
As far as products... ive only used Griots chrome wheel polish and that stuff is the best wheel polish ive ever used (i manage a detail shop for the record.) A lot of times i feel like its process over product. Ive used the meguiars 3 or 4 step line on my moms swirled up 4Runner a few years back and had awesome results.
Whole vehicle all done...
Ive tried many waxes side by side and couldnt tell a difference in shine... though Automagics EZ wax gives you awesome tiny beads when the car is wet.