The Nintendo Switch 2 is the latest one, the most expensive and the most powerful. The previous generation Switch comes in 3 versions, the standard Switch, the Switch OLED and the Switch Lite.
Switch Lite: handheld mode only, 32Gb internal storage, smallest LCD screen (5.5")
Switch: comes with a dock to play connected to your TV, 32Gb storage, or handheld mode with its own screen (6" LCD)
Switch OLED: same as Switch except a bit more internal storage (64Gb) and a very nice 7" OLED screen.
If you're not interested in playing the latest games the Switch 2 isn't worth it. The screen isn't as good as the OLED.
I would definitely recommend the Switch OLED of the Nintendo consoles.