Preferred position for giving a bj

I would like to know what position do you prefer giving head in. Do you like the guy to be standing and you being on your knees? Or him sitting in a chair or on edge of bed? Or do you like it when the guy lays on the bed on his back?

Of course, you could ask the ladies whether they profess to excel in a particular position, and whether they are willing to show you.

I recommend this one, positioned on the bed with my back against the headrest.