I roughly summarize the value of accessories using the following scoring system:
Rarity
  • 1 for SR
  • 2 for SSR

Buff: Using Slashley's criteria, total up the buff value. I heavily favor affliction rate up and always give these to my debuffers with debuffs that miss, regardless of rarity.
  • 1 for tier 2
  • 0.5 for tier 3
  • 0.25 for tier 4 (I'd actually put rage meter reduction in T3, especially for attackers)

Value = Rarity + Buffs

SRs are plentiful, relatively easy to level, and give you a wide selection of T2/T3 buff combinations, so I favor these unless there's a deficit of more than 1 compared to R or SSR alternatives. In other words, unlike Slashley, I don't usually max Rs. The intended result of this scoring system is that if an SSR doesn't have at least 2 T2/T3 buffs, it typically loses to SRs by default.

Note that this is a simple scoring system I'm proposing to summarize findings using my Accessory Comparison tool, as detailed by Slashley. The scoring system may yield value approximations that are not consistent with actual value, either your's or mine. Use the tool when in doubt to evaluate simulated effects on effective HP and damage.