How much faster is a Dillon 550b than a Lee turret? How many more rounds an hour on average? I'm sort of surprised it's not an auto indexing press...maybe I need to watch some videos.
I've got both of those, so I will add my experience to the discussion.
I don't like to run full throttle when I load, I prefer to move at my own speed. Having said that, I generally do about 150/hour on the LCT when using the auto-index and press mounted powder measure and primer system. I could easily do 200 if I wanted to.
I do about 450-500/hour on the 550. That is counting stopping every 100 rounds to pick primers and load the primer tube. Adding a case feeder would speed things up. Please note that, while the 550 will do rifle calibers, the optional case feeder for the 550 will only do pistol calibers.
Once you get into the rhythm, the lack of auto-indexing is not a problem IMHO. I will say that I always stand while using the 550, as I have it mounted using the Dillon strong-mount (which elevates it) and I like to look down into EVERY case to inspect the powder drop before I place a bullet.
I use the LCT for decapping ALL the brass that I process, since I wet-tumble. I have a collet bullet puller I use with it as needed.
I use the LCT for my revolver and rifle rounds, since I shoot less of those and I can pay a little more attention to each round. I use the 550 for all my semi-auto handgun ammo.
Hope this helps, and good luck!