Neither..............................go have a look at Makita. Will certainly outlast anything DeWalt make and are just better built than almost anything made by Bosch.
Is it still the case that DeWalt is actually Erbauer internals in a yellow casing at a massive markup?
He's not too far from the truth. I remember one day we were messing about with a Dewalt cordless and charger and inside the charger was stamped Black & Decker. Maybe it's different more recently but they used to share parts.
I have been using and servicing Dewalt tools for over 10 years and have never seen a B&D part.