I'm guessing Paul will be the first "starter" from this group. I think he's a better prospect than Speights was, more instinctive vs the pass and feels quicker in his change of direction.
Speights has two advantages, those being a full year in the system, as well as an ability to stop runners in their tracks. For his size he is very strong.
Both are close on their 40 time. I think ideally Paul & Speights are the pairing on early downs. But the big question is who comes off on passing downs. And in that comparison I think Paul's pass game instincts will win him the job.
Oh and btw I would not rule out Dolac in any regard. He's faster than both of them, though he played weaker competition so we'll have to wait and see how he translates.