All have 300dpi resolution Paperwhite and Voyage have 6-inch displays Oasis has a 7-inch display
Oasis is the slimmest, Voyage is the lightest Oasis has a square design, while Paperwhite and Voyage is rectangular Oasis is waterproof
Physical buttons on Oasis for page turning Oasis has Bluetooth for connecting headphones or speakers Support for Audible on Oasis
Oasis has longest battery life Two storage options for Oasis
Same software
Oasis is most expensive Paperwhite is cheapest
