I have not flown either for a long time. My general feeling is that CA vs MU is also kind of like Beijing vs. Shanghai. I find the CA cabin crew more down to earth and warm (Northern Chinese attitude) while MU is more refined (Southern China) and have a little of that Shanghai attitude

Kind of like ATL based DL crew vs. EWR based UA/CO crew but in reverse (DL like CA and UA EWR like MU)