Ice shards is faster and hits harder than Firestorm, even without ice attune while firestorm is with fire attune. Ice shards > Firestorm.
It may hit harder if you are an Ice mage with full ice mage gear and ice attune.
However when you are a fire mage using ice magic skills you often miss out on valuable
Ice Magic ability bonuses that gear from that type of mage would be. So due to the Firestorm skill being boosted by Fire Attunement in addition to the
Fire Magic provided through gear you use such as.
-Necromancer fire magic rings
-event ammy fire magic buffs
-event charm possible fire magic buffs
-fire bolt mord brace or a fire event brace from yule(what most would use) both add fire magic
All this fire magic will decrease one of the most important elements in a Mages DPS, Ability.
There is enough evidence to support the fact that mages Ability has a direct link to the amount of skills evaded.
As to your mention of
Ice shards is faster and hits harder than Firestorm
when i just tested both skills with a stopwatch without any recast gear both were at exactly 15 seconds of recast time
However ice shards took 1 second to use and Firestorm took 2 seconds.
Due to any proper mage would have about 5000+ of their own ability before another i would estimate randomly that the time taken to cast firestorm over ice shards would not give any distinct advantage due to the amount of extra evades that would most likely occur.
hits harder than Firestorm, even without ice attune while firestorm is with fire attune. Ice shards > Firestorm.
Ok this is quite a large statement and i would like to know what facts this is based off as at 50/50 on my skill page ice shards is only at 6698 damage with a build consisting of 4000 ice magic(not maxed yet) and 2005 focus. and if i recall correctly my firestorm was around 7-8k on page
As to the gear swaps that could be possible i think it highly unlikely that most mages would gear swap more than 1 or 2 gears simply due to the hassle and i dont think its wise to consider gear swaps in such a basic assumption due to the amount of extra variables that would need to be included.
Oderint Dum Metuant.