Okam is a better fit at NT than Branch...but he is not as NFL ready as Branch. Branch however projects as a 4-3 DT like Shaun Rogers..or a 3-4 DE.
As badly as we need a pure NT, we need some power and size upfront even more. I'll take Branch as he will add a physical mentality and tremendous size to our D-line. If we could find a pure NT to along w/ him...he and D rob would be a very good DE pairing.
It's very difficult to find a 3-4 NT who is ready to go straight from college. ideally we need to find that guy in free agency. Branch at DE in the 3-4 like Seymour would work nicely.