So which one is better? In terms of service and materials used (wax, etc...)

I actually use Big Bert's paint protection service before and once in a while. The boss at Araneta branch also removed serious paint transfer scratch on my bumper with results that is worth every peso I paid for. In other words, I'm very satisfied with Big Bert's. Their Araneta branch is where I go to because it is closer to my location.

I haven't tried Hillsborough Detailers yet. From what little I gather from the forums, they are charge quite high, friendly owner and staffs, are located quite far for me (Libis, Eastwood) and etc...

I'm interested to hear more about Hillsborough.