Between the two I'd rather roll the dice on Dumervil then Freeney, even though I suspect that Dumervil will be much more expensive. The difference to me is 4 years of age. There is value to vets, but when they start getting too old they are quite likely to have rapid physical declines that leave them as semi functional shells of their former abilities. The history of 37-38 year old pass rushers isn't good. The 33 year old pass rusher isn't a great bet either, but that is a pretty big 4 years in sports. Of course there is a health question on Dumervil.
If you want Freeney because of soft factors, fine, but there's not a good case for him having much positional value left. 2015 was a very odd stat line, and I'm guessing was a bit fluky.
Personally I think I pass on both, unless there are injuries later in camp and you need a body with some ability to fill assignments. I still might go a little more toward upside as opposed to likely solid older players but then its at least a question.
