Personally since I raid more these days I just gave my Fungi to an alt and started wearing the SS BP full time. While the Fungi regen is nice, once you have Torpor it's barely noticeable. The right-click on the SS BP, on the other hand, is absolutely essential when you're the only Shaman buffing a whole raid.
But in a world where all my alts already had Fungis I'd wear the SS BP when raiding and the Fungi any other time ... although I'd probably still swap the SS BP in to buff people, since that's faster and mana-free
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