I will go with the mini! I want long bat life.
With the 510, your batt life will be maybe 1.5 hours, depending on your
vaping habits. The Mega Titan-510 batts from Totally Wicked are worth the price, and last about twice as long. I have a bunch of those and a 5-batt recharger. For regular 510 batts, I recommend getting the PCC charging case. If you get an extra batt with your kit, that will be 3 batts total, and the PCC will charge your batts while you vape with the others. You can easily get a days worth of
vaping that way. Also, the USB passthrough is recommended for when using a computer, but also has a battery in it so you can unplug it and vape on the go with it.
I have a GreenSmoke, which is like a super mini. Much prefer the 510. Smoother vapor, and more of it. The PT is really nice.
Kurt