From levels 1-45 or so, Fungi will be better when soloing and grouping. This is because mobs levels 1-39 are significantly weaker than mobs level 40+. The 150 hp/minute regen does a great job of keeping pace with the mob's average DPS, and you have a smaller max HP pool at lower levels. This means it takes less time at lower levels to get back to 100% HP.
Fungi is also great at all levels when fear kiting. You can avoid a lot of meditation downtime by using clickies and regen items while fear kiting.
When you reach level 50+, I would use Vindi over Fungi when tanking in a normal group.
Vindi BP gives you at least 150 max HP when you are level 50+ and not STA capped. This means you are soaking 1 minutes worth of Fungi Tunic regen per heal that puts you back to 100% HP. The extra AC from Vindi is reducing the damage you take, and the AoB is still giving you 20 HP/Minute. Vindi BP can easily soak more than 150 damage per minute, depending on how often you get hit and healed.
The resistances also help a lot when dealing with casters, which will put Vindi BP further ahead of Fungi in those scenarios. Having 15+ all res on a single item may allow you to swap out less gear for resistance gear, meaning you may be able to keep more AC and HP gear on.
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