I got postpaid with Celcom, Maxis & Digi
depends on location or area all of them sucks haha
but if you ask me Maxis is the worst among all

I am around Ampang 60% of my time ( Digi is okay, celcom okay, maxis goes nuts) and the rest around KLCC ( maxis okay, digi not so, celcom ok) or bangsar ( maxis sucks, celcom ok, digi sucks)

So its heavily area dependent, i need to use data / hotspot / call all the time