Blood bank car vs. hospital VS. no blood bank car...

Breast augmentation methods vary so much from hospital to hospital, so there's a lot to worry about, like choosing saline vs. coagulase ...ㅋ Hospitals that use blood bags say that when they separate the muscles during the surgery, there's bound to be some nerve damage and bleeding, so if they don't use a blood bag, the blood will later pool and clump together like sutures, which will have a bad effect on the sensation of the skin. On the other hand, hospitals that don't use blood bags say that their muscle separation techniques are so excellent that there's very little bleeding, so they don't need a blood bag. I can't tell which one is right. ㅠㅠ Also, hospitals that don't use blood bags say the maximum is 275, but hospitals that do use blood bags say the maximum is 320. I'm really having a hard time deciding which hospital I should listen to. Those with experience, please help me. ㅠ.ㅠ