Icicles does 8.9 damage every 2 seconds at level 50 according to CoD, so 44.5 in 10s.
I can't remember what damage a proc does at 50, but this is the required logic. Say it does 70 damage, 20% of the time, checking every 10 seconds, so an average of 14 damage/target/10s. That is the equivalent of 14x100/44.5 = 31.5% enhancement, which means that until you're close to the cap, damage enhancement is better. The purple proc, because it goes off more often for more damage, will be better than just slotting for damage.
It's true. This game is NOT rocket surgery. - BillZBubba
Another concern, of course, is that you can get set bonuses. I have Icicles slotted with Scirocco's Dervish.
Paragon City Search And Rescue
The Mentor Project
Simple rule of thumb: in most damage powers, compared to some powers that do trace amounts of damage, you will get more damage by max slotting for damage than slotting damage procs. Only add procs after you have maximized your damage slotting.
Exceptions are powers, often AoE control powers, that do small amounts of damage incidental to the main purpose of the power. Example: AoE Immobilize or stun powers like Fire Cages or Flashfire for Fire Controllers. In these powers, you get more benefit from a proc than a damage enhancement. Plant's Roots is an exception to the exception, where slotting damage is better.
LOCAL MAN! The most famous hero of all. There are more newspaper stories about me than anyone else. "Local Man wins Medal of Honor." "Local Man opens Animal Shelter." "Local Man Charged with..." (Um, forget about that one.)
Guide Links: Earth/Rad Guide, Illusion/Rad Guide, Electric Control
Just a quick question about sloting icicles. For some reason my brain isnt working and the mathhammering it isnt working out. Is it worth while to slot icicles with three procs for raw damage output? Orrignaly evidence pointed to yes, but then I worked it out a bit more and I may have made an error.. anyone can toss me an answer to it?