I have always preferred white over the yellow I am sporting because, aside for winter, they are the easiest to see on the ground and film/ photograph the best against whatever background you are shooting against. However, Innova and Discraft so rarely make white runs in translucent plastic. Trilogy, however, strongly caters to this color, but I could not commit myself to be strictly one brand. My GStar T3 and GLine PDs are nearly impossible to replace. So, I am going all yellow.
As for knowing which one to pull out, in the four years I have been doing this, I have only made that mistake once. I pulled out a Star TeeBird when I meant to throw a Star Roadrunner. I did not get the flip I wanted, so I settled for a par instead of a possible birdie.
For me, it is all about placement in the bag. I go from putters to mids to fairways to distance drivers, from least to most stable. From there, I can tell the difference between the discs next to each other. A C-FD clearly looks different than a GStar-T3. The issue I am currently having is between the T3 and PD. That one I will definitely check twice before I throw, but if I put discs back in their proper order, even then I should not have an issue.