Total newb here who's only dabbled with emulation on a 3DS (good, but pretty terrible UI, clunky.)
What's a good option for a Mac owner (and doesn't want to dualboot Windows) that's hoping to play DS/PS1 games? Up to PS2/GCN would be a perk.
There's a gulf between PS1 and PS2. Every cheap device plays PS1. How important is PS2 to you? How important is DS (since that requires a touchscreen or a willingness to severely compromise)?
Your computer OS doesn't matter. If you know how to copy files onto an SD card, you're good.