One class to iLevel 460 or 475 - what do you pick?

I love the mobility of the Mage but have found swapping between Frost & Fire for world quests & BGs is annoying lol

I’m fine with having 2 sets of gear vs reforging…

just wish Fire was quick and effective for doing invasions and such - of course I could be playing the spec wrong, but Frost just seems much quicker.