At level 50 a sitting troll only has 22% more hp regen than an ogre/barb. With rubi bp factored in, it's 19%. Using every single one of the extra HP for canni, a troll will get roughly an extra 20 mana PER MINUTE over an an ogre/barb.
Think about that. 20 mana. Per. Minute. A single Envenomed Bolt is 320 mana. That's one extra Envenomed Bolt every 16 minutes or so.
The racial regen does not become significant until Kunark and post-50, at which point the availability of higher sources of regeneration still keep the increase relatively small. With as much regen as a 60 shaman can stack in Kunark, a troll will have 16% more standing hp regen than an ogre/barb will. Sitting it's 19% more.
So basically the only time when racial regen comes out to be significantly higher health regeneration is when it's considered at level 60 and without fungi tunic/staff and, obviously, pre-Torpor.
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