When I'm doing doing long cooks from 275*-325*F in my Akorn, I use briquettes. They burn longer and more evenly, IMO. I prefer the hardwood briquettes and my favorite is Royal Oak Chef's Select. If you have a Do-It-Best Hardware store nearby, you can order them online and have them shipped to the store for free:
I've used Stubb's Briquettes and like them too.