On the patch 6.0.2 (6.0.3). It is not accurate to compare fire vs frost and arcane vs frost. Why? Well:
The most important secondary stats for Arcane is mastery and for Fire it is Crit. These gets boosted by the 5.4 gear.
For Frost, the most important secondary stat is Multistrike, which there are very few (almost no) gear that has it.
On patch 6.1 Mirror Image got nerfed.
Highest dps long fights: Arcane > (=) Frost > Fire
Highest dps burst: Frost > Arcane > Fire
New stat for Frost: Multistrike.
Secondary stats: Multistrike > Haste > Mastery > Crit
15 Blazing Speed/ Ice Floes
Comment: Both are good depending on fight.
Blazing Speed is very good since it will be like an extra blink.
If you need to move away fast from incoming damage.
Ice Floes is good on fights in which there will be a lot of movement
while doing damage.
30 Ice Barrier
Comments: Always good to use during all fight and time it on heavy incoming
damage. The reason why Alter Time is a no no is basically because
the opening rotation is not the same anymore in which Alter Time
gave that extra damage. It does not capture procs anymore so thumb
down for Alter time.
45 Ring of Frost/Frostjaw/Ice Ward
Comments: People say this is a PvP choice only. Lets agree to disagree
Ring of frost can definitely be used on PvE. When doing dungeons
or raid and many mobs are incoming, it can be good to freeze some
of them while nuking the others, at the same time helping tanks
from getting a lot of damage and making it easier for healers.
The one you should have thou for boosting your dps is Ice Ward
since it will give you extra finger of frost if there are mobs around
the player you use it on
Comments: Best choice for PvE. Enough said.
75 Ice Nova
Frost Bomb if Tier 17 set bonus
Comments: This row is completely changed.
Icy Nova does 100% increased damage on the target and does
damage to ALL nearby targets and freezing them for 2s.
Frost Bomb is not like it was before, now it works like a dot instead.
This dot incrases the damage you do with Ice Lance, meaning the
more you proc (when you actually proc) Finger of Frost, the more
damage you do (then when you normally proc)
I’ve tried all 3 spells and the winner is Ice Nova followed by Frost
Bomb (multiple and single target). Don’t even bother with Unstable
90 First choice: Rune of Power
Second choice Mirror Image
Third choice Incanter´s Flow
Comments: Mirror Image is not like it was. These mirror guys does a lot of dps.
When they are up they are number 2 of your spell dps and do
approximately 15% of the damage. Also, it’s now on a 2minute
cooldown. When testing it looked like Frost Bolts from Mirror Images
gave me Brain Freeze proc. I’m not sure of this and will verify it soon.
Mirrior Image does less damage now (Nerfed on 6.1)
Rune of power increase your spell damage by 15% when standing on
it. Sure, use it on fights in which you will stand still all the time. This
is now on a 3 minute duration and still on 2 charges.
Incanter´s flow gives an average of 12% dmg (between 4-12%). This
spell in cycling every 10 second.
I have switched to ring of frost now after they nerfed the Images. Just
remember to have it up ALL the time were ever u move.
100 Prismatic Crystal
Comments: Comet Storm looks cool. Thermal Void is shit.
Prismatic Crystal does insane dmg. Use it on Aoe and single boss fights.
Dps rotation, step by step
Place the Prismatic Crystal
Pop Icy Vein
Cast Frozen Orb (to do damage but also to trigger Finger of Frost)
Cast Ice Nova you have 1 or 2 charges of Fingers of Frost procs.
Cast Ice Lance when you have 1 or 2 charges of Fingers of Frost procs.
Cast Frostfire bolt when Brain Freeze procs.
If there are mobs, cast Freeze (from Water Elemental), this will give you Finger of Frost procs.
If its a boss, cast pet Water Jet and shoot 2 Frost bolts, this gives u 100% Finger of Frost procs and BIG chance on Frostfire bolt proc.
When waiting for procs and cooldowns and procs, cast Frost bolts.
Rinse and repeat
Normal spells that you will use for dps
(Cone of Cold)
Spells from talent tree that you will use for dps
Rune of Power
Spells you will use to help controlling the situation
Ring of Frost
(Cone of Cold)
Spells you will use to defend yourself from the situation
Passive spells that gives you Procs
Finger of Frost
Spells that enhance the change of giving you Procs
Freeze (Pet spell)