I have a small struggle too when I was trying to buy a new mask last time.
First is black, then there is clear, then people talk about why black is good again....
let me share my 2 cents.
To me ambient light does not just offer me a better feeling (brighter overall), but as the gentleman here mentioned "to improve vision", I always compare that with the vision I need on land. What if something moving towards me from the side, and I have cutted my peripheral vision? This is a bigger concern to me than "the feeling of brightness".
Then when I tried the low volume/capacity black mask, my concern was released, since the distance between my eyes and the lens are closer, the degree of peripheral available was more acceptable (to me). Plus, by this time, some photographers (here and at the LDS) talked to me about minimizing internal reflection, e.g. when somebody shines his light towards our side while we are taking photo. So I ended up with a new black mask, and my clear is now my backup, which is good.
Finally, the world is not perfect, experts here reminded something, the low volume masks are less desire for blocking bubbles from the regulator (bubble interference)... so I think you also need to put that into account for your situation.
I realized something, although I tried to read couple of threads here before I went shopping but this was when I put different masks on, I realized which one is suitable for me.