The only advantage of not going to Northrend at 68th is avoiding the collections, a bit more.
With the adjustment of experience needed for Burning Crusade, I usually reach 70th late Blade's Edge or early Netherstorm, with all of Shadowmoon Valley untouched.
I agree, moving to Northrend at 68th is both better gear and more experience per quest.
However, at 80th, the quests in Shadowmoon Valley aren't worth a whole lot of gold.
At 80th, the quests in Icecrown and Storm Peaks are worth a fair bit of gold.
If you're willing to take more time to get to 80th, there will be more gold from quests available.
You could easily hit 71st or 72nd prior to going to Northrend if you did everything in Burning Crusade.
Granted, there will be some annoying collections in Outland which you'll want to pass.
But you'll have the equivalent of a whole zone worth of leveling done before Northrend, which will mean less collections necessary.
I'd personally still go to Northrend at 68th.
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