I have the Rockchucker and the Dillon 550. Both have there place.
The Dillon shines on making good ammo for pistol/revolvers in great quantities. In my opinion, it does not make rifle ammo as well as the Rock chucker. Furthermore, if you want to make tournement quality handgun ammo you will need single stage press and weigh each charge.
I started out on Rockchucker and "progressed" to Dillon this is a good plan, you will need both they do different work. Do not expect the Dillon to meter powder good enough for target rifle. But it works fine enough for my bullseye ability, however, some guys will only weigh each round for pistol tournements.
If you plan to shoot alot of handgun rounds, you will neeeeed the Dillon, if you want to reload for extreme accuracy you will neeeeed the Rockchucker. If you want to be a great shooter and compete at a competitive level (not my level mind you) you will neeeeeed both.
Before you buy either you must pay your dues with at least two reloading manuals. Research pays off.
Good luck, have fun, stay safe.
Fred