Back in early 2023 when I got my first retro handheld, the Miyoo Mini Plus, there were already quite a few options to choose from when it came to affordable emulation consoles. This task has only gotten more difficult, with many companies competing in this space and releasing dozens of new handhelds each year. The good news is that, generally speaking, prices have been going down (excluding tariffs and shipping fees), while overall quality has been improving.
Nowadays, emulators for older retro consoles require very little processing power. NES, SNES, Sega Genesis, and anything older can run on basically any modern chipset. Even Game Boy Advance and PlayStation 1 titles are easy to emulate and run smoothly on most devices. Dreamcast and PlayStation Portable is where a bit more power is required, but all handhelds on this list can handle them competently, even the cheaper options.
The price bracket of 50 to 100 dollars is, in my opinion, where you get the most bang for your buck. Without the need for power-hungry and heavy internals, these devices can focus on being portable, affordable and, well, fun! Here's a list of the ones I think are most worth your time and money. You just have to think about which games you want to play and which form factor suits you best.