To the OP;
I started reloading about three years ago, and my first press was a Lee single stage. My first cartridge was .223 Remington. Lots of steps to reloading bottle neck rifle rounds. So I learned each step of the process one at a time, in the most tedious way possible. And along the way I made a ton of mistakes. But because I was going so slow, I caught 99% of my mistakes before I seated a bullet in a case. On at least three occasions I didn't, which resulted in some laughable results at the range. Fortunately, I somehow avoided rounds stuck in the barrel or anything that went boom.
Last year I upgraded to the Redding T-7 that others have already mentioned. It's a huge leap forward. It's much smoother, more powerful, and just much more gratifying to work with. I would imagine that the RCBS turret would offer similar results.
At first, I think the biggest advantage to a turret vs. a single stage press for a newbie reloader is going to be the ability to switch from step to step without having to unscrew a die and replace it with the next one. Turrets are kind of "set it, and forget it," affairs.
But this may come back to bite a newbie, because knowing how to set your dies is pretty important. There have been times when an issue cropped up while reloading that had to do with how I set the die. As I've become more experienced (slightly), the reality is that exactly how I want my dies set has changed a little since when I first started. So in that respect, changing dies all the time with that single stage ended up working in my favor, because by the time I understood more about what I wanted, I'd reached a certain level of experience and a comfort level setting and resetting dies.
Anyway, overall I don't think you can go wrong either way, but in the long run I believe you'll end up using and growing with the turret style press more than a single stage.
P.S. Just a side note, but my other single stage, an RCBS Rock Chucker, is still bolted to the bench, mainly for depriming purposes, which you'll find is a very dirty process, and cleaning my turret press is enough of a PITA, that I decided to relegate that step to a single stage. My turret is much cleaner for much longer now. So, at some point you might end up with a single anyway, if you opt for a turret now.
P.P.S. I forgot to add, that I use the extra holes in a turret for another caliber, mostly. So for example, I have my 9mm dies and my .40 cal dies on the same turret head.
But they can also be for additional process dies, such as crimping dies, or powder drop dies, etc.