What colour pen do you think is the best to write with? Red, Blue, Green or Black.

Red? Maybe Blue? Green? Or Black?

probably blue

Mines black.

blue

I change the color of the pen according to my mood.

blue ofc

I prefer either blue or black. I usually just type stuff on a computer instead though.

Black or blue definitely! :)
Black is probably the most common and formal colour to use to write, though blue is equally nice. I'm. not sure about green, it's nice, but some people will not accept writing in that colour. Plus, light green can be difficult to see in. And I guess I just don't like writing in red - my own opinion. :)

My mood matters.