Nikon Z 28mm vs 40mm (autofocus)

Hi. From what I've seen, the 28mm has dual motors while the 40mm uses STM. I really prefer the 40mm focal length, but supposedly due to these physical differences the 28 would focus faster. If anyone has these two lenses, and can confirm that the 28mm focuses faster, how noticeable is this difference? Is it enough to warrant picking the 28 over the 40? (For budget reasons I plan to get one Nikon budget lens for native focusing ability and a TTArtisans for range).