Sir oem brakes are oem brakes whether you buy them from dealership or you buy them from market. Its not like an Atlas dealership casts a spell on the pads and makes them better 
The brake pads I bought are oem. Only difference is I did not buy them from a 3S which keeps its margin of sales tax, income tax, extra profits and overheads above the cost.
It’s not just brake pads in every case exactly the same parts are cheaper out of dealership. Atlas doesn’t make the pads itself they are imported and the same part is available elsewhere also. If its a HONDA OEM product it doesn’t matter where its bought from.
Rest its your choice of you want to buy the exact same thing for 20,000 additional just to help pay taxes and overheads etc of the 3S dealership