Geometry adjusted, emulators optimized for 240p. This consumer 14" CRT doesn't show great scanlines but if you play very near is good.
This Blueretro adapter works very good on GameCube slots for bluetooth controllers like my 8Bitdo Pro2.
I learned PSX emulation isn't very good on Wii so not the definitive 240p retroconsole but it covers a lot for very cheap.
I've actually always preferred a look with minimal scan lines but there's no question that pixel art looks significantly better on CRT.
You can have good pixelart on flat screens using shaders but yeah, CRTs are great.