I did all of Howling Fjord and half of Borean Tundra, and had more fun in HF. Saying that, at least one quest chain in HF seems to end unsatisfactorily if you don't do the counterpart in BT, so...idk. Do both! Lots of rep that way.
I am TOTALLY hitting the level cap before Cataclysm. :DDDD After that I'll be levelling up my professions (maybe even cooking, which is still sitting at 1 point) and going back to grind rep for my favourite factions. I've heard anything you buy with justice point seem super expensive right now because it's all been balanced for the amount you'll be earning at 85, though, so you might want to stockpile those for a while.
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I am TOTALLY hitting the level cap before Cataclysm. :DDDD After that I'll be levelling up my professions (maybe even cooking, which is still sitting at 1 point) and going back to grind rep for my favourite factions. I've heard anything you buy with justice point seem super expensive right now because it's all been balanced for the amount you'll be earning at 85, though, so you might want to stockpile those for a while.