Isn't that hard to determine without specifying which engines are used in your chosen instance? Searx/Searng has provided superior results for me using a combination of engines compared to anything provided by any of the alternatives by themselves.

This will create rss feeds with the full article. It can then be used in your aggregator/reader of choice to allow offline reading. I use it in combination with FreshRSS and Feeder on android.

https://github.com/heussd/fivefilters-full-text-rss-docker