When comparing Metager vs Presearch.org, the Slant community recommends Metager for most people. In the question“What is the best alternative to Google search?” Metager is ranked 4th while Presearch.org is ranked 14th.
Ranked in these QuestionsQuestion Ranking
Pro Allows to visit search results anonymously
Pro Open Source
Pro Tor network service
Gives access within Tor.
Pro Run by a non profit organisation dedicated to privacy and data protection
Pro Supports easy search in open-street-map
Locations can be shown on open-street-map.
Allows users to earn tokens for searches conducted on the platform.
Pro Community driven
The algorithms are provided by the community allowing for transparency and no manual manipulation.
Users can choose which engines they use most (i.e. Github for developers or image searches for artists).
Pro Easy working and customer friendly
Con Uses only Bing and Scopia results
The latter of which could be their own crawler.
Con Requires to login to use it
You can't even read the "About" section without creating an account.
Con Portal vs. Engine
It's currently a search portal; the engine is scheduled for release sometime later this year.