I swapped one of the bulbs in a few weeks ago and finally remembered to check the output at night. It puts out bright, clean, white light...but is no match for the bulbs that I already had.
The color on these isn't quite as white, but the output is significantly higher in all directions, especially down towards the ground. These are the ones you want:
https://www.amazon.com/gp/product/B017EI8X54/
2004 Titansilber Metallic BMW 330i ZHP
Yeah, that's definitely an issue with LEDs. The light tends to wash out contrast and actually make it more difficult to see driveway edges and such. I really can't give you an accurate answer since (1) I live in the city and never reverse down a dark driveway and (2) I have cheat codes [backup camera].
I have similar ones (https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1), which I think you actually recommended, and they're definitely an improvement over the factory incandescent bulbs. Sadly, no longer in stock.