OsmAnd~ is really good and feature rich but a bit complex. I use it because it has very good navigation with the public transport where I live. I tryed Magic Earth, it's simpler but at some point it stopped suggesting me navigation with the public transport here. And if you don't need public transport suggestions try Organic Maps, it's very simple.
On Linux- Marbel by KDE or Gnome Maps.
If I need to check something on the map I just use OpenStreetMap in a browser.
OsmAnd~ is really good and feature rich but a bit complex. I use it because it has very good navigation with the public transport where I live. I tryed Magic Earth, it's simpler but at some point it stopped suggesting me navigation with the public transport here. And if you don't need public transport suggestions try Organic Maps, it's very simple. On Linux- Marbel by KDE or Gnome Maps. If I need to check something on the map I just use OpenStreetMap in a browser.