To this day people still argue over which is the better system way back in their gaming youth, it doesn't matter if it's the Amstrad, C64 and the ZX Spectrum, or the Amiga versus the Atari. It's a topic of conversation that has lasted many years and it's why so many Facebook groups are very computer specific, try posting an Amstrad in the ZX Spectrum group and see what happens. So what does a user by the name of SuTeKH/Epyteor do on the CPCWiki forums? He tries to prove that the Commodore 64 palette is far superior to the Amstrad CPC by converting many C64 pixel art images over to the Amstrad and comparing them! So in a word posting a C64 topic in an Amstrad group!
C64 Left : Amstrad Right
And that is just some of these images he has converted, so I'll let you be the judge of which is the better palette. But for the rest of the images they can be viewed on the CPCWiki forums HERE and the main C64 images can be viewed HERE