I made a few videos to show how Torpor Shamans regenerate with Torpor. People seem to think Torpor Shamans are not at 100% HP a good portion of the time. Only when they are actively in combat or casting will they be under 100% HP.
https://www.youtube.com/watch?v=HjZxMlJSCDc
This first video is me Torporing from low HP and Mana to full HP and Mana. The total length of the video is 3 minutes 47 seconds. A Troll would have regenerated 304 extra HP compared to an Ogre in this situation. That is 1/4th of a Torpor. You are saving casting one Torpor at best to get that 300 HP back. That is 24 seconds. Then you will be at 100% HP and NOT regenerating until your next battle or casting session. Regeneration isn't very useful when soloing.
https://www.youtube.com/watch?v=bq39ybDWx-k&t
Here is a second video showing a simulated scenario of raid buffing 10 people with Riotous Health and Focus of Spirit, with two Primal Avatars thrown in. The total time is 12 minutes and 45 seconds to cast all the buffs AND get back to 100% HP, which is where you will stay in a raid a lot of the time, since raiding has a lot of waiting. This video is a little longer than a real situation, because I waited until 100% HP to re-FoS myself. This was to make sure people didn't claim I was healing with FoS to reduce the video time. A Troll would have regenerated 1004 HP in this time. That is basically 3/4th's of a Torpor. You are STILL only saving 24 seconds, or one Torpor. Then you will be at 100% HP, and not regenerating. Regeneration isn't very useful when raiding.
In grouping, you are saving a ton of HP most of the time due to having to tank less, and having a much higher total DPS with more people. Shaman soloing can be slow. You certainly aren't going to be spending more mana than the raid video I posted above in most cases. Regeneration isn't very useful when grouping.
I am not saying Regeneration doesn't help. I still use Fungi Staff, as shown in both videos. But it is not very useful once you have Torpor. FSI will help you in more situations than the low yield regeneration from Trolls, and the fact that you will be at 100% HP a good portion of the time. Any Torpor Shaman that isn't Torporing/Cannibalizing back to full life and mana is just playing the class inefficiently.
If you want to argue Trolls are better if you are super lazy and don't want to Torpor/Cannibalize, then I guess they are better. But in that scenario, you are less efficient than Ogres/Barbarians who play the class correctly. This ruins the whole argument for Regeneration anyway, since the main point when arguing for Regeneration is it allows you to be more efficient.