Originally Posted by
Daeth
Here's the perspective you are always going to hear that overall single target damage goes from:
Arcane > Frost > Fire
Movement heavy fights favor Frost over Arcane and cleave/AoE fights will favor Fire.
The only issue is realistically every spec is available for play regardless of sims and what people think HOWEVER the biggest factor amongst these specs and what is the "best" realistically breaks down into gear. With Highmaul gear there is a lot of multistrike available and Frost is generally the more "easier" spec to play so people tend to do better with that. With more gear, Arcane/Fire are an option however Arcane is much stronger imo as movement heavy fights don't technically impair Arcane because you can swap to Incanter's Flow and you'll lose a bit of DPS but nothing dramatic enough to declare Frost a stronger spec. The only issue with being Arcane that is if you choose to go Arcane that means swap all your enchants to mastery ones, so it's a 15k-ish gold commitment and playing Frost as your offspec with mastery enchants is a big no-no since mastery is garbage for frost. But you can do it vice versa, if you like Frost and would like to play Arcane on fights such as Butcher then go Frost with multistrike enchants and have Arcane be your offspec, you'll only run into issues where you'll probably want to play Fire for tectus and crit is your best stat but swapping gear/trinkets would work for this since you'll only really play fire here unless you have great gear for it (Mythic) in anticipation of BRF.
So overall all specs are playable, Frost is better at lower levels and into low Mythic but as you get more geared Arcane becomes stronger and when you become more optimized, Fire is do-able on any fight that is 2+ targets in Mythic. I would start out as Frost and move to an Arcane/Fire build at 672+ ilevel or remain Frost if you can play it better/have better stats for it.