A general question. It might be useful for future DC home brew developers to know. I personally always play on a widescreen trinitron in 16:9. I’d be curious to know what others prefer.
A compromise for future home brew could be to design the graphics to be in the correct proportions at an aspect ratio of 14:9 which is in between 16:9 and 4:3. It won’t look overly screwed in either modes.
Dreamcast: Blue Swirl, 60hz, White LED, Removable battery holder, Internal SD card reader, BBA, DreamPi, RGB Scart