After doing a little bit of research and watching a few videos, IMO, Rambo is the best safety in the draft. And this is coming from someone who was a skeptic at first. The dude has the best tackling form of any other safety I've looked at and also looks more natural in coverage than the other.
Reid is by far the worst I've seen so far. Takes bad angles and gets beat easily in coverage. I swear watching him was like watching Tony Dixon.
I'd go DL/OL in rounds 1 and 2, then pick up Rambo in the 3rd and hope he keeps his nose clean.