BajtheJino
I'm looking at you.
I would file a route, or you could leave it blank and get whatever ATC gives you (as previously stated).
I've never heard/thought about filing "Radar Vectors".
If you are flying a trip that is of reasonable length, im sure you would not just enter "radar vectors".
Therefore perhaps if you are flying a quick hop and leave the routing blank, ATC would clear via vectors or direct. If you lose comms and are in VMC, heading back or to a nearby uncontrolled airport would be the best choice.
Now if you are in IMC, perhaps you could proceed to a fix on an instrument approach to that airport, then inbound. your thoughts?
Best thing to do is file at least one fix, or direct.
No, do not file radar vectors. There is no such thing. Briefers will not take it. Duats will not take it. It does not make sense.