RGB Vs CMYK (Color Mode)

RGB color should be used for display screens
CMYK color should be used for printing purposes

RGB has a larger color gamut than CMYK, therefore you'd want to design your logo in CMYK to ensure it will fit both printing and display color spectrum If you want the color to be fairly consistent.

It is important to note that just because you're able to convert the color to RGB and keep the color consistent according to Adobe and even on your screen, you might notice two completely different colors once you have the printed piece in hand. There isn't much you can do without extensive color experimentation to find the matching color values.

reference
http://gustavoatar.com/blog/wp-content/uploads/2010/11/ColorTheory_Screen_White.jpg