It depends on the technique you're trying to perfect. Obviously with Acoustic you might have trouble doing certain things on it, but if you can accomplish it on acoustic, it'll make it that much easier on Electric.

My acoustic is messed up however, so I just stick to electric.
electric. boogie woogie woogie
My Gear:
Gibson Les Paul Standard | Gibson SG | Casio PG 380 | Dave Mustaine VMNT | Digitech Whammy | Carvin Legacy head |
Carvin V3 combo | MXR Custom Badass Overdrive | Dunlop Jerry Cantrell Wah | Rocktron Banshee | Ibanez PG Flanger
if i had an electric, i would probably practice a few things on there
but for the most part, i would definitely practice on my acoustics a lot more, it would just make it an easier transition to electric for me

Mitchell MD100S
Yamaha CS40
Dean V-Coustic
Laguna LE122

Line 6 Spider III 15W