When comparing Metager vs Siik, the Slant community recommends Metager for most people. In the question“What is the best alternative to Google search?” Metager is ranked 4th while Siik is ranked 11th.
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.
Pro It has news
It has a very cool news section.
Pro It has its own index
It's not a metasearch engine.
Pro Entities search
It shows up entities and descriptions from Wikipedia.
Con Uses only Bing and Scopia results
The latter of which could be their own crawler.