But Which Type of Colour

RGB Color 

RGB is color based upon light. Our computer monitor and television use RGB. The name "RGB" stands for Red, Green, Blue, which are the 3 primaries (with green replacing yellow). By combining these 3 colors, any other color can be produced. Remember, this color method is only used with light sources; it does not apply to printing.

CMYK Color 

CMYK is the color method based upon pigments. "CMYK" stands for Cyan, Magenta, Yellow, and Black (its what the K stands for). Using these 4 colors, most other colors can be achieved. Unfortunately, CMYK cannot reproduce the same amount of colors as RGB can, which is why yellow-greens sometimes   look a bit muddy when printed.
This is the method used by printers the world over, and is also a clever way of mixing paints.

                                                       Pantone (PMS) Color

PMS (you can see why this doesnt get abbriviated as often) is yet another printing color method. PMS stands for "Pantone Matching System," and is a large list of specially mixed colors made by the Pantone Corporation. Instead of using CMYK to create colors, the pigments are created individually for purity. 
color is made exclusively for your project and would always print exactly how you want.
The only drawback to using PMS colors is that they're only useful for projects with few colors. They're also expensive.