Supervisors:Phd life line?

People said Phd is very much depending on your supervisors, they are like your life line, talian hayat sehinggal berjaya dlm PhD. Btw, I have two active supervisors, A is my main supervisor and B is my associate supervisor, the post doesn't matter as the responsibility ratio is 100% each.

I had a hard time with B when I first came, for me B is less sensitive to an international student like me, she is "very australian" to me and unfriendly although she is a psychologist! A, on the other hand is very understanding, the fact that she's teaching cross cultural psychology and married with a foreinger do help! B almost withdrew from being my supervisor because we had a 'tough' time at first but I admit that B has her own strength in the sense that she gives very fast feedback and she is sharp and she is very particular. Hence, I decided not to withdrew her although I can if I want to, as I thought she is very good. After a while, we can lessen the gap between us and she seemed to understand and sensitive to my ways of doing things. I am happy with our relationship nowadays. On the contrary, I felt very helpless with supervisor A who is always busy most of the time as she secured thousand dollars grants, and always delayed in replying my emails and giving feedback. I was so frustrated recently as she forgot and could not recalled that I submit a 20-pages doc to her before I left for Raya and expected her to read and comments after I got back, that did not happened. I knew that she she can make herself available if I really need to see her, but I do not want to be so pushy and demanding. I am grateful that I can rely on supervisor B and thanks to Allah as I decided to have 2 supervisor instead of one, my life will be miserable if supervisor A is the only one, thanks God.