Kushka, can you help me with why would you go with the manual? I don't know much about their differences besides the obvious, push a button or don't. Trying to make an informed decision since my first one pooped out on me in 2 days!
It is like deback stated - even if you just use cartomizers and never dipped - you will sometimes overfill them a bit. If you are not very careful to be sure that never happens a drop of e-juice can get down inside an automatic battery and kill it. I have killed 2 passthroughs and one battery that way. I love automatics because I have arthritis in my hands.
I just got a new automatic today (after killing one) and I am careful - but not careful enough. So I also have manuals and use them on my good days - and even on bad days I try to take the first few hits from a full cartomizer on a manual before switching to an automatic