You just have to figure out what type of music you will be playing most of the time. If you're a folk singer and just plan on strumming chords, acoustic is the obvious choice. If you want to play rock and focus on lead guitar, electric is probably better.

On a side note, acoustics are less forgiving on the fingertips of your fretting hand due to the higher gauge steel strings (unless you get a nylon string acoustic). Though this will only be a problem in the beginning before you build up some callouses.