Good question, @khajta.
And great answers already from @pieper and @mangotee.
I’d like to comment on this part:
To my knowledge, there is no open-source model yet which was trained with Auto3DSeg on TotalSegmentator data. If you know one, please send me the link, happy to look into it.
We trained the Autro3DSeg on both TotalSegmentator V1 and TotalSegmentator V2 and made available on the Slicer MONAI Auto3DSeg: GitHub - lassoan/SlicerMONAIAuto3DSeg: Extension for 3D Slicer for running MONAI Auto3DSeg models
Please download the latest Slicer and install the Auto3DSeg via the Extension Manager.
It’d be great to hear your thoughts on these models 
Hope this helps,