Shouldn't we worry about which exact system something is played on? Right now it gives only one option which is "gameboy & color" but there is:

• emulator (BGB)
• emulator (Gambatte)
• emulator (VBA)
• gameboy player
• super gameboy 1
• super gameboy 2
• possibly more (some 3ds/wiiu e-store stuff?)

Here is a comparison screenshot from a long time ago: (note that sgb1 is wrong in this image, because it uses the gbp video. Otherwise, you can note that emu generally runs faster. But this doesn't take into account loading times etc.)