I started on a single stage and still use it (I sold my progressives a while back, including a 650). I load all my metallic on an itty-bitty RCBS Jr. press. Pistol is done in batches - resize/deprime in one step, flare and reprime in the second, load powder/seat bullet/crimp in the third. Since my loading blocks are 50-count, I load 50 at a time. Using a turret means you turn it a lot and do one complete round at a time, whereas batching them does partial processing on a bunch of them
Progressives are faster, but can present problems of their own. Their major downfall, no matter shotshell or metallic, seems to be in the primer arena - no primer, flipped primer, sideways, etc., which then cause other problems if you're cranking away and not paying total attention.
Where a progressive shines is when you have one load for one cartridge and you get everything set for it and you run and gun. If you're doing load development, and therefore loading in small batches to find one that works, a single stage or turret actually work better.