I would recommend bottom coil for sure, as they seem to be a lot more user friendly. Just fill them upside down when they get empty and you're ready to rock and roll. CE3 disposable bottom coils from (almost anywhere) are generally pretty decent and run around 20 dollars a pack (5) here in Canada at a brick and mortar store.
Elsewise, MT3's are awesome cause you can vape whatever the heck you'd like and not worry about your tank falling to bits. Replaceable too. VaporJoes has a link to MT3(S) heads on sale right now as well if that's relevant.