I rotated through both in med school. The pros for rad onc from what i could tell are lifestyle as the clinical side of the work was not terribly interesting. The treatment planning (radiation fields and whatnot) was cool as hell but managing things like butt burn from prostate irradiation remind me of assisting in butt puss operations in my surgery clerkships.
The pros for path is that it is a hell of a lot more interesting, pays well if you can find the right gig, and gives you the opportunity to specialize in almost anything you want.