I’m using BeFree. Definitely not quiet if you were to pump in a quiet environment. Battery seems to be a big con for this pump, it is said to be able to last 90 mins after one full charge (2.5hours) but after 2 months of usage (I pump 4-5 times a day), I have to charge after 40 mins of usage. (2 sessions) But still, it yields better than BeMine.
Using imani i2+! It's quiet enough that I can pump beside my lo while she's sleeping. Yield is quite good too!