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All things being equal I would pick Pink, Its easy to find in all seasons and pretty much all terrain.
The color affecting flight issue really comes down to the environemental conditions at the moment of that run. Lets say its humid on monday when they ran 8 hours worth of Red Bosses. It takes longer for them to cool, and the result is a bigger dome. Dome being bigger makes them more stable than the 8 hours worth of Yellow ones the next day where the humidity was lower and they cooled faster with less dome.
Anyway in the beginning until all the Reds and Yellows sell out and they make subsequent runs of each color, it will seem like all the reds are domey because they are red, when in fact its because they were made that particular day. Its why some models its the pink ones are popular while others its the reds and so on. Whatever the trait you are after, you'll like the disc color run the day the environmental conditions made that happen.
I have a friend in the club who has his entire bag full of pink right down to the putters. It looks like one of those revo display shots where all the discs are one color. The backups in his car all pink as well. He swears by their visibility. I fill special orders all the time for him. We always joked we'd make him carry the pink bag as soon as someone produced one.
I think Revo is making a dual pack in pink now or has one planned, but that probably takes a little committment to pink than he's willing.