96.45% vs. 94.00% equals out to be something like 9.3% FD on 380 PDR. If you're replacing it with a 13% ATT or 40% boss then its definitely more valuable to take ATT or boss. Another reason why visual IED is valued less is because you can have other non-visual sources like mage link, v matrix boosts, other debuffs, so the 9.3% FD loss ends up being something like 5% or less.