The Anbernic RG35xx is basically a slightly larger version of the Miyoo Mini (which is extremely hard to get these days).
And to make it feel like the Miyoo Mini, we include GarlicOS - a port of the popular OnionOS of the Miyoo Mini.
The port is from BlackSeraph, who is happy about support on Patreon (which helps him to continue development so you can also receive futher upfates).
In contrast to the Miyoo Mini, the RG35xx offers a second SD card slot.
A suitable and prepared 128GB SD card is included, so you only have to copy your ROMs onto it and you're ready to go.
The processor is a CortexA9, which can emulate all classic retro systems up to and including the PS1 without any problems.
The 3.5" IPS display with a resolution of 640x480 pixels is perfectly suited for retro games.
Thanks to an HDMI connection, you can easily connect it to a TV. Bluetooth and Wifi are not available, though. However, Anbernic mentions that you can connect 2.4GHz controllers to it... unfortunately we don't know more details ourselves yet :)
Besides the usual DPad, Start and Select as well as four fire buttons, there are also 4 shoulder buttons - similar to the Miyoo Mini.
Analog sticks are missing, but they are not necessary for the emulated systems anyway.
If you are desperately looking for a Miyoo Mini and are comfortable with a somewhat larger handheld, the RG35xx is recommended.