I think we have established a couple of things here.
1. I am a dinosaur from an era when command was important and coveted.
2. Being in command with an idiot in the other seat is infinitely better than the opposite arrangement.
3. Getting command before 30 is nothing to discount. More time in the right seat can lead to right seat apathy and possibly cause an extended period in said seat. How many years to upgrade in the jungle jet?
4. It should be watever lifestyle suits you best, not what type you fly. If turboprops offered me the pay i make now, i would be there tomorrow.
5. You will not go deaf in a Q400 (unless the noise cancelling thing is on MEL) and you are flying the best non-second-world-war-fighter aircraft to ever have two props on the wing.
My money still says take the left seat if you like your company and are not in any hurry to move on. Otherwise, it makes no difference what you do.
Cheers.
Hater