I don't think I can say whether playing acoustic first makes you a better player overall. Most people start on acoustic because it's generally cheaper I would think. I started on classical because that's what they did at school.

As Draven says, electric guitar is a very different instrument - you'll need to mute a hell of a lot to control the noise, and you use techniques you might not on acoustic. I think it's more important to play the music you want to play, and pick the instrument that fits that style. Simon and Garfunkel material is dodgy through an overdriven electric rig, and Iron Maiden just ain't the same 'unplugged'...

You'd have to play for ten years on an acoustic, record your opus, forget everything you ever knew, learn again on electric for 10 years and record opus II then compare the result to answer that question... ;)