Most accurate display on emulator

Which Windows emulator has the most accurate display. I am making a game and one of the tiles is not showing correctly on an real spectrum +2 machine, however on my emulator, it looks just fine. I am running Spectaculator and have tried the windows version of Real Spectrum and cannot duplicate the feature.

On Spectaculator I have tried to "Mimic a TV screen", with and without Pixel Smoothing and TV scanlines options. I have also adjust the TV Picture Quality from Aerial to Custom. Also on custom, I set it to the worst quality. Any Ideas?

Thanks
Andy