I'm also a relative newbie, and I started electric. Then, because I was travelling for work for a couple weeks and didn't want to lug my amp (small and weak as it is) around with me, I got an acoustic so that I could practice in the hotel. I still primarily want too play electric...but I almost never touch that one and instead do almost all of my practice on the acoustic. I also feel myself getting better faster using acoustic. You just need to be more precise with your fingers on the acoustic -- there's less room for error, which you could either find frustrating or challenging (in a good way).

Then again, I agree with the post above that says "whatever keeps you playing" is the best way to do it.