I use a lot Ecosia (which gets results from Bing) due to them allegedly planting trees and being much more heavily into privacy.
My experience with Ecosia, thus Bing, is that for the overwhelming majority of searches (90% plus) the quality is comparable.
When you get into more niche searches Bing offers better results 1 out of 5 times and worse results 4 out of 5, with a worrying amount of those 4 being almost complete misses.
I still need to get onto Google occasionally when I don't find what I was looking for on Ecosia.