Of the libraries I've owned (never owned an NES or SNES so those libraries don't count)...
1. Switch: Largely seventh-gen ports and indies, but there's so much to choose from.
2. GameCube: Some fun games here, even if a lot of PS2 and Xbox games were missing.
3. DS: I played an ok amount of 3rd-party games and they were fun, namely the Scribblenauts games.
4. Wii: Some fun games here and there.
5. 3DS: I've heard the 3DS has a great 3rd-party library, but I think I've only played 2.
6. GBA: Didn't play too many third-party games, but there were a lot released.
7. GB/GBC: See GBA.
8. N64: The N64 was certainly lacking in third-party games.
9. Wii U: I don't think I need to go into detail.
Lifetime Sales Predictions
Switch: 151 million (was 73, then 96, then 113 million, then 125 million, then 144 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 57 million (was 60 million, then 67 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima