Inside drywall corners-mesh vs paper
Mesh has two three issues:


It requires more coats and coverage.
It is not manufactured to middle split evenly.  No folding line like paper.
When applying joint compound to mesh there is an art to not getting the corner of your knife on the mesh.   I have had to use mesh late at night for inside corner repairs.   Using mesh in a corner forces you to use your knife's corner meaning your knife will snag on it as you are putting more stress on the inside when tapering the compound.   Meaning you will have snags or the worst when doing a corner - moving the mesh.


In a lot of years drywalling and hiring some really good crews I have never seen anyone use mesh for an inside corner.   You could but why do something that is harder, takes more time, and could be flawed over time.   

The best drywall guys I have seen only use tape for 95%+ of the job.   The mesh is for binding drywall to something else.   Even the pro-mesh guys (these weren't the best) have rolls of paper for inside corners.