Purposes and Use-Cases for different AntiAliasMode settings?

[CrossbowDemon]

What do the different modes do and what is generally the best one and why?

In MacType tuner the options are:

No anti-aliasing Greyscale anti-aliasing Light anti-aliasing Optimized for LCD(RGB) Optimized for LCD(GBR) Light+LCD(RGB) Light+LCD(GBR)

[snowie2000]

Generally speaking, you should go with LCD(RGB) or light (RGB), they have basically no difference.

For all the other possible modes, I would like to describe them as:

1. No anti-aliasing for bitmap fonts.
2. Greyscale anti-aliasing for displays with pentile pixel layout or with a super high pixel density
3. Light anti-aliasing I don't know, I just kept it as it is
4. Optimized for LCD(RGB) for the most common LCD display panel.
5. Optimized for LCD(GBR) for some professional display panel, they are using this special pixel layout
6. light+lcd are here for legacy reasons.

[CrossbowDemon]

Generally speaking, you should go with LCD(RGB) or light (RGB), they have basically no difference.

For all the other possible modes, I would like to describe them as:

1. No anti-aliasing for bitmap fonts.
2. Greyscale anti-aliasing for displays with pentile pixel layout or with a super high pixel density
3. Light anti-aliasing I don't know, I just kept it as it is
4. Optimized for LCD(RGB) for the most common LCD display panel.
5. Optimized for LCD(GBR) for some professional display panel, they are using this special pixel layout
6. light+lcd are here for legacy reasons.

Would 3840 x 2160 at 27" with a PPI 163.18 be considered high enough for greyscale?

Or would standard full subpixel LCD(RGB) still be the best choice?