Generally speaking, "Who's the Best?" is for historical topics. For example, in the past we've started conversations such as "Who's the Best -- Thor Artist?" and "Who's the Best -- Frankenstein Monster?" Start a conversation that is broad enough to elicit an ongoing conversation, and that even might lend itself to tangential musings.
Thanks for holding it down for us!
In an attempt to rescue today's post from the depths of indifference, Doug steps in to ask: Who's the Best... DVD series you either own or wish to own? He asks a follow-up question -- Who's the Best... TV program yet to make it to DVD?