Dillon presses and dies are all for doing quantities. They are into progressive presses. The Lee and other single stage or turret presses will work well for smaller quantities at a time. They are also easier to learn the process on compared to any progressive press. Progressive presses have a lot of things going on at the same time. The others for the most part only have a single operation per handle pull. That way you can concentrate easier on what you are doing. The dies all seem to work in a single stage setup. Some might be a little better then others, but, the end results are nearly the same.
I just like having the same company's dies in their press. If you read some of the posts here you will find which setups work with the fewest problems and give you the most bang for the buck. Save the progressive presses for the times when you need quantity. You will still probably be developing all you new loads on a single stage press even if you do have a progressive press some day.