This is tough.
I think the Atlantic has the premier talent i.e. their 3 best teams are better than those in any other division
However they also have the biggest discrepancy between best 3 and worst
Central is top to bottom full of good teams, with some great ones (Preds, Jets) and realistically their worst teams are still competitive (Chicago, Avs)
Metro has two consistently great teams in the Pens and Caps who are arguably top 5 teams in the whole league. However the rest is average. Not bad or poor but not really good either. CBJ are inconsistent as are the Flyers
Pacific is hard to read. They don't have any one outstanding team (VGK could be but we'll see how it carries into next year) other than maybe a healthy Anaheim. The big 3 of Kings, Sharks and Ducks is aging but are still good teams. The rest is like the Atlantic- downright bad
Overall I'll give the nod to Central, with Metro behind.
I think the Metro is one division alongside the Central without a pushover and a division where at the start of the season, each of it's teams can be viewed as evenly matched with an opponent at their best (outside of the real elite like Pitt and Tampa). For me this separates the two from the Pacific and Atlantic