Favorite handheld system?

With the increase in gaming handhelds over the last few years and the interest in old hardware. From being a traditional console, an emulation machine, or can only play one game. Even with PC handhelds, such as the Legion Go and Steam Deck, you wonder what the preferred system if for on-the-go gaming.

As an example, I enjoy my uses of the Switch portable but have dabbled in the emulation handhelds, pretty good for what it can do.