Those are both cool spots. I personally like the look of the driver side better - it's an otherwise wasted space (and I LOVE taking advantage of otherwise wasted spaces), and is within your view but doesn't block your line of sight like the center location does. BUT, I use my mic with my right hand while driving and that would be a bad spot because the mic cable would run across the steering wheel and interfere with your other hand operating the vehicle, so I'd probably end up mounting it above the center of the dash instead. If you're a lefty and use the mic with your left hand, I'd say driver side.