Here’s a new one
https://youtu.be/b6AYs_0HLgQ?si=NNU-qNy6fzAgk1vY
Is it the echo?
I think that the difference is having a choir properly trained in blending and fullness. In your first post, the first video sounds like a group of men trained to sing well together. The second video is of a whole church of trained and untrained voices singing together. Trying to get a whole congregation to blend together is almost impossible.
For example here is a song I made to be sung like chant where it is full and smooth sounding but in the video there is no church with acoustics to help with that. It is an old style of singing that you don't see as much these days unless you are trained. It took me at least 2-3 years to get the traditional Catholic choir I was director of to get a nice blend (before I was married and now rarely sing except for weddings).
https://youtu.be/IFt0OJBzUFs?si=HDYoU9ZB2uL0qF4d