GTK3Vice 3.3 on the other hand the sound is SUPER muddy and it's no surprise as the default filter bias there is -3000(anyone know why such radical setting?).
So, what should I use as a reference?
Edit: It seems that the version of GTK3Vice that I just downloaded doesn't respect the filter bias setting at all. The sound remains the same no matter which value the bias slider is set to. :-/
JSIDPLay2 like all the others make use of ReSID, so I believe that considering 8580 the only difference is what settings are used in each player / emulator.