You should at all costs avoid RGB enhanced, as this likely means "expanded to PC levels" which introduces banding and clisp BTB and peak white data. USe RGB standard
4:2:2 and 4:4:4 are component YCbCr output.
Between YCbCr and RGB, it depends. There is a serious problem with component video output and upconversion if the player doesn't twist the SD601 colorspace component encode into HD709 so that the colors are maintained properly when the TV decodes in 709 when it receives an HD signal. If your player does not twist the colorspace into 709, then you should use RGB as the player does the decoding and it should avoid green depression problems.
As to the difference between 4:4:4 and 4:2:2, the former is better, but it depends on the bits too, I think HDMI can output 4:4:4 YCbCr 8-bit, and 4:2:2 YCbCr 8,10,or12 bit. So depending on the bits output, I don't know where 4:2:2 at higher bits would be preferred. in Any case it should be easy to switch between the two options and observe, as well as to switch between RGB and YCbCr output to observe for color decoding correctness.
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