I have both the 510 and the Automatic Stick. The 510 is great b/c of it's reliability and thick vapor (although battery life sucks on the 510). I've only had my Stick for 2 days and actually took a break from the stick yesterday b/c I was hitting it way too much and my throat is raw.

The stick in my opinion does produce about the same amount of vapor (if not a bit more) than the 510 depending on type of juice you're using; although, you're going to get more flavor from the juice in the 510 than the 801 atty in the Stick. I've always experienced that smaller atomizers whether it's the 510, 901, or disposable cartomizers always produce more flavor than an 801 atty no matter what device it's in (Stick, Mod, or Penstyle).
From a battery reliability, cart life, and ease of charging/ pass-through capability; the Stick is what you want compared to the 510. If you like extra flavor (as I do) and thicker, warmer vapor...go with the 510. Just my opinion.