Seems like retro consoles look better on 15khz CRTs while retro computers feel upgraded but still "authentic" on 31khz CRTs. 31khz seems like a balance between too artificial but clearer flat panels
Converting 15kHz analog RGB to digital
RetroBlast! - Arcade Monitors Setup Guide
480 Hz Monitor Prototype Now at Blur Busters! | Blur Busters
RGB Video Card | RetroRGB
A perfect 15kHz/50Hz-compatible modern LED screen for retro computing. – The EspenSkog Blog