You know, I have thought about this one quite a bit myself.
The receiver mount would be great - you can leave it in the garage when you're not needing it, which would save on weight running around town, and prevent tampering / theft concerns. It would also be protected from the elements when you know you won't be needing it.
My problem is I'm forgetful as all get out. I know I'd set it out, and then go 'wheeling without it. Therefore, mine's going up front.
There is also the 'cool look' factor. But, being able to winch from front or rear would be handy in many situations I'm sure.