Depends partially on your stats and capabilities as a player. If you have a trash helmet but really good rings then FI will probably only be marginally worse. If you mess up on using DC on cd then it will only be marginally better.
Depends on stat allocations and sire and generals loot slots for your class. For disc command its wrist or ring. Bracers have the smallest stat alloactions of all gear so fat ideal secondaries would be better. Its also like a 5 int difference between 235 and 226 for wrists. Same how for hunters the rings better than shoulders cause sire or generals drops mail shoulders with ideal stats.
As far as I remember, shoulder was better than ring for my rogue legendary. But at like 10-20 dps difference; I don’t care.
And this way, when I get a shoulder from vault I don’t feel like trash while vendoring it. Can always use two rings!