Super understandable!

At least it occupies the lower end of the retro handheld price bracket. Some of the handhelds I've reviewed have been worth a stunning amount, I just love how the lower end with a niche laser focused specific purpose like this one can be a more approachable price. You could wait for the 11/11 sales coming up soonish on Aliexpress, they're famously pretty good for discounted prices :)

I'm not entirely sure if it is the exactly same gap size, but the screens do match with the action. The best example is Sonic (Rush, I think it is called?). The action matches sync on both screens, there's no Hz misalignment as we saw on the RG DS back last year before release (and the patch which fixed it!)

They're super different handhelds, despite being ostensibly the same thing!

I have two of the Thors from AYN. One is the Thor Pro they sent me back before release to review, the other is the low-end entry model, the Thor Lite. And to me they perfectly nail the 3DS requirements. Obviously you can run DS games to your heart's content as well, even the Lite model has more than enough power to run them.

The DS Plus has the advantage of two screens matching size (the original DS had the same size top and bottom screen), and the resolution is exactly 4x that original size. So (this isn't upscaling), what you get is 4x 'integer scaling'. It will present the pixels perfectly!

The Thor Pro will run anything from Switch to the WiiU, PS3, PC game emulation, 3DS upscaled like you wouldn't believe. But it is designed to be wonderful at everything, and has a price to match that. The DS Plus is super affordable and perfect with DS games. The included stylus you store in the body is the icing on the cake to me!

Power? Upscaling? Emulating any and all systems? AYN's Thor. DS? Older low performance systems like PSX, GBA, SNES and so on? DS Plus.