We were at DLR last Month staying at DLH. The security lines for the park in the mornings are currently long with the addition of the metal detectors. If you plan to be at the front of the rope drop crowd, then I would go to the park front gates- but you will want to get there early before the security lines build. If you want to be there around rope drop, but not at the front- what we did every day was go to the GCH gate about 10 minutes after rope drop. We never had more than one or 2 families ahead of us. We had hoppers, so we used that gate even if we were going to DLH and then just park hopped across. We wound up coming in a day early and had to stay at one of the Harbor hotels as the DLH was full- it was around noon or one since it was our arrival day- but we were in line at security on that side for over 20 minutes. It did not seem like the DTD side was as bad, but if you try it and the security lines are long, I would backtrack and go to the GCH gate. Some people don't like to miss that first 10 minutes- but we did not mind it at all- the convenience of basically walking in the park with no line at all was worth it to us.
The line builds at RSR fast, but if you can use the single rider line, you can hit it multiple times a day without that much of a wait. We got several rides on it every day we spent time at GCH and I don't think we ever waited more than 10 minutes this year. We walked on it a couple of times. We waited about twice as long in the fast pass line as we were with single rider. Also, you can go get FPs for RSR instead of running there first thing if you aren't in the front of the rope drop line.
As far as the early morning as opposed to the regular morning- that GCH line can be really long. If you get there early enough to be towards the front you would be good-- if you miss part of the early morning and get there late enough to miss the main line, you are probably good (like our 10 minutes after rope drop)---- but if you are going to hit it when the crowd hits or right before or at the opening time, you are probably better off at the main gate.