One thing to be mindful of with ventilated discs is that the extra weight of the disc increases the unsprung weight of the axle. If you don't compete and generate the heat between the piston, pad and disc, then it's probalbly better to use solid discs.
Ventilated discs might look good and hint at fantastic braking power but if they're hidden behind a wheel and can't impress onlookers and you don't need them, why incur the axtra weight and expense!
