OEM pads are not as good for brake dust, and won't last too well if using them on track days. There's probably not a lot in it cost wise compared to the yellows.
If I remember correctly textar are the OEM suppier of BMW (or was it Audi?)... either way, perhaps a good option if you want to stay "stock" but save a few quid.
I've fitted textar ePads. Not done many miles but things seem good so far and they are really low.on brake dust. ECP have an extra 10% off too this bank holiday!!