Hang on to both for as long as you can. There may very well be a trade in the works for one of them on draft day. I wouldn't be surprised.
I'm in the same boat as you........I have both Bennett and Smith and am also hoping Bennett gets dealt, making Smith a solid starter. Whooo, with that mammoth O-line in Minnesota, I'd feel pretty confident that SOD could surpass Bennett's numbers.....especially in the TD dept.