Myself personally, it would go to ABUniverse.
Although they're somewhat up there in the pricey side, especially for Canadians, the way Casey interacts with everyone is beyond what's excepted for a AB/DL company owner.
They had a weird beginning. However, Casey really pulled the company out of the rubble, and has continued to give 10/10 costumer service. I also love the designs on their diapers. Just wish they would come out with new AB/DL stuff (i.e. Onesies, pacifiers, bottles). *tsk tsk*