As a novice-never-reloaded-before I started on a Dillon 450 circa 1980.  Jumped up soon to 550, loaded on it for 20 years.  Sold it for more than it cost me new (with dies/tool heads) for step into 650.

Now closing in on nearly 40 years reloading.  Never had nor needed 'single stage' nor anything else.  If I want I can use my 650 as a sort of single stage.

For me it was a question of 'would you rather spend your time shooting' or 'would you rather spend your time reloading'.
I learned how to operate the Dillon, which in reality is just like a single stage only 5 different aspects of that single stage going on at the same time.  You learn to pay attention to nuances, the way a musician in a symphonic orchestra learns to play their instrument together at the same time as everybody else.

Stimulating and very efficient!  One handle pull, one bullet reloaded. 

Outstanding technical support as well from the factory.

I never had a single stage press. I am soon to add one just for pass through sizing 10mm.

The Dillon XL650 is awesome. I have the case feeder and a MR. Bullet feeder and I can crank out 100 rds in 20 minutes. I might have $1200 bucks in atm but its capable of 800 rds an hour when you get it dialed in.