It’s really a personal perference since we all search differently. They each have strenghts based on different type of queries. I personally don’t like results from DuckDuckGo alone. Also they have their own crawler these days to sumpliment results from Bing API. https://duckduckgo.com/duckduckgo-help-pages/results/duckduckbot

I use a mix of all indexers with SearX and the best results for me come from Quant. But it’s nice to have all of them to compliment each other.