MASS AIR FLOW Question

Hi Guys 

I tried to buy a MAF Sensor from Diesel Electric & after we went to get the one out of my car for the sample the guy didn’t want to sell me a Bosch one & told me I must go straight to the Agents since mine is branded by Siemens/VDO

Is this a thing or I can use Bosch as well? Because my thinking if it’s 3 pins it should be fine. 

Car in Question is A E46 330i

Thanks.