I like the Tormek systems. I think the T4 (https://tormek.com/en/products/sharpening-machines/tormek-t-...) would be good for most who just wants something to be able to sharpen knives once in a while.

If knives and sharp objects are your thing, you probably want to go with one of the bigger models.

Classic ones with rotating wheels. These continue to work after ages.

https://www.amazon.com/Sharpener-Jonurphy-Sharpeners-Rotatin...