Hello and Welcome to ECF! You've already taken the first step in deciding to quit, and look into e-cigs.
As far as the "best" choice of e-cig goes, thats very subjective. It all depends on what form factor you like.
Liquid is Liquid, the cartridges contain the same liquid, but with a filler material that soaks it all up. Once empty, you can just refill and keep on
vaping.
Manual/auto
batteries are just that, the manual you just press a button to use, while automatic you just inhale and vape. I would suggest finding your closest Vape shop and paying them a visit. Look
HERE, there seems to be a few Brick & Mortars in Houstin Texas. Im sure they will be glad to give you some hands on information, as well as let you try some flavors to see which you like.
Additionally, there is a wealth of information available on this forum, which can be confusing at times, take your time and read through what interests you. Many questions you may have, will have already been answered somewhere in here.
Good luck.