Volume needed, time constraints and money for purchasing equipment are three of the prominent factors in deciding on what equipment to buy.
I always add one more, mechanical aptitude. There is a lot of support for all progressive equipment nowadays. A phone call, the internet, are both tools to help those that can't remember "righty tighty, lefty loosey".
There isn't anything wrong with folks that are have that problem, it just means that they are going to have some hurdles to overcome if they get one of the more sophisticated progressives.
There are other levels in between too. DougE has mentioned one, the auto indexing turret press. Quite handy for those that may be limited by price. Moderate volume, economical, sturdy, practical.
I have 3 single stage presses, one stationary turret press, a Lee Classic Cast Turret press, 3 Square Deal Bs and a Dillon XL650. Up until this January I was loading for several folks, including myself, to shoot competition.
As of now, my Lee Turret press would be able to keep up with volume quite well. I'm not planning on selling any of the progressives though!
(One of them in the near future, as soon as he gets his own house, is going to our oldest son and family. They have 4 boys so far!)
If I had to do it all over again, I would just get the XL650 and build from there. I can use it as a single stage for load development if I want or get it all going together and make a bunch of ammunition in a hurry. Maybe I would keep a single stage around just for those 10 round batches, not sure though.
If you have money to spend and you want the best progressive presses on the market, look at a Dillon. Their customer service is enough to buy their equipment, second to none.
p.s. I have heard good things about the Hornady L-N-L AP too, I just have never used one.
FWIW