I think for a younger person, the electric guitar is better to start with. It has cool factor. You probably won't loose interest because of all the different sounds you can make. After awhile all the fooling around will probably start translating into some actual progress in playing real guitar and interest will probably last longer. Of course this can be a little more expensive. Especially when you start buying all the add ons for electric guitars.
Acoustic is very practical and will sound great when you start to learn how to make proper chords and rythmes. But the acoustic can be a turnoff if the progress is slow.
The key is to get a guitar that you will want to play. The more you play the more you will learn.
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