I can only comment on the Glamourmom and the Bravados because I've owned those two and don't have experience with the other brands. I loved the Bravado ones! Very supportive and gave me good torso coverage. The Glamormom one was the regular nursing tank and it was ok, but it was not as supportive for my build. I usually just wore it to bed at night because of that.
Also, with both the Bravado and the Glamourmom I always felt 'covered' when lifting my top to nurse.
I hope you find a great one for you..good luck!