Mesh per Chunk Vs. Mesh per Voxel

I am currently creating a minecraft like game and have been following a tutorial by AlexStv. In the tutorial he gets each chunk to collect the vertices, triangle, etc., information from each voxel and then generates a single mesh for that chunk. I am wondering whether it is more efficient to do this as opposed to simply creating a mesh for each voxel. If you could please list the positives and negatives of each scenario that would be really helpful. Thanks. Tutorial - http://alexstv.com/index.php/posts/unity-voxel-block-tutorial