Amazon top is by Unit sold.Are they?
Let's compare the best selling NPD games to the best selling games on Amazon in 2017.
NPD:
1. Destiny 2*
2. Tom Clancy's Ghost Recon: Wildlands
3. NBA 2K18
4. Madden NFL 18
5. The Legend of Zelda: Breath of the Wild**
6. Grand Theft Auto V
7. For Honor
8. Horizon Zero Dawn
9. Injustice 2
10. Mass Effect: Andromeda
Amazon
1. Super Mario Odyssey (not actually a factor in NPD results yet)
2. Mario Kart 8 Deluxe
3. Breath of the Wild (Switch)
4. Horizon Zero Dawn
5. Splatoon 2
6. Breath of the Wild (WiiU)
7. Kingdom Hearts HD 1.5 + 2.5
8. COD WWII (PS4)
9. Crash Trilogy
10. Uncharted Lost Legacy
The lists aren't very similar.
I think NPD top is by value.
A XboxO/PS4 game cost generaly more than a switch game.