As a few have mentioned, Dickson is the more athletic of the two...faster, smoother route runner, gets open. Dickson however displays alligator arms and brick-like hands at times. Pitta, on the other hand, has shown time and time again to have very good hands. Think of Dickson as the deep-threat TE and Pitta as the guy who finds the hole in the zone.
Have not heard that about the route running. In fact, IIRC, I heard the opposite. According to the combine Dickson is just barely faster (4.67 vs. 4.72). Not sure that is enough of a difference to make one of them a deep threat and one guy a zone dump off.
The combine was 4 years ago? I've seen these guys numerous times at training camp before they shut out the public, I've seen them play in person in 5 or so preseason games, I've seen Flacco and the TEs play in person 15-20 times in regular season games. The rest of the games I've watched on the ole TV. I was attempting to provide a distinction between the two: Dickson looks like a WR on the field, Pitta looks like an H-back/TE. I haven't timed em in the forty to see who's faster, just eyeball test based on their play against defenders. Dickson has been laid out a lot by defenders running post and deep crossing routes recently. I'm starting to wonder if he's hearing footsteps as the ball is being delivered. Pitta, on the other hand, catches just about everything thrown his way. I wasn't saying that Dickson was only a deep threat guy and that Pitta never ran anything deeper than 5 yd routes, just if you're comparing the two; it may help distinguish them. I can say with a %100 percent degree of certainty that Flacco trusts Pitta more than any other rec on the team.