User engagement. A visitor that spends hours on the site each day, producing content in the form of discussion, is worth a lot more than a visitor that drops in for two minutes in order to spew some spam into the queue, and then leave. I don't think there's any question that the reddit community is more engaged than the digg community...a brief perusal of the comments at both sites will quickly eliminate any doubt.

As for revenue, I said that more pageviews and much faster growth from a much leaner organization was better. There were several variables in my statements.

Besides, it is not a small difference in pageviews. It's ~40%! Which pretty much certainly equates to more visits and more unique visitors than digg.

No matter how you slice it, though, digg is a 100+ person operation that is generating less value to consumers than a 6 person operation. Value to consumers is a reasonable proxy for the kind of revenue you can generate from a site. They just haven't found the formula for monetizing it yet. It doesn't mean the value isn't there.