Originally Posted by
Dragon9870
Noxxic also says it's recommended to use the Arcane Explosion glyph as ALL THREE SPECCS, says the Combustion glyph is "Optional" and not "Recommended", and for Frost, it fails to mention the Water Elemental glyph. It also says to pick up NT for Frost, which is just flat out wrong unless you're using LOTC.
Noxxic is the new AskMrRobot: You don't use it. (On a brighter note, AskMrRobot has been working much better recently, though some items should be taken with a grain of salt. If you're smart, it's a great tool to get a quick list of item upgrades)
OT: OP, it's more or less a gear thing. Fire scales amazingly well with gear, and we'll be seeing a LOT more Mages play Fire in 5.2/ToT as a result. Frost doesn't scale nearly as well and is definitely the least gear dependent (so far). I'd probably say based on your gear, Fire would pull ahead.
In terms of specific fights, Frost is by far the best at mobility with Fire not too far behind. I'd say try it. Just don't get too discouraged if you see lower numbers right away. Fire is a heavily RNG based specc, and it's highs and lows vary greatly based on it. Overall though, you'll probably see an increase.
PS: Something to keep in mind: Your 4P is near useless assuming you're doing PoM/Alter Time Combustions, allowing you to drop those Hit/Mastery shoulders and your Haste/Mastery pants (or Crit Mastery helm) for better choices, such as the Haste/Crit shoulders from Gara'jal or the Haste/Hit pants from Sha of Fear. There's also a Hit/Crit helm if you get lucky from Galleon, or a Haste/Hit helm from Will.