Thats something i never knew that just the colour of a radio can effect the frequency of it.
it was a joke (sort of), Spektrum is notorious for being one of the worst quality radios on the planet, most racers in my area typically switch over to Futaba, Airtronics, Radio Post etc... heck there are even more Fly Sky radios than Spektrum locally, ha!
If you are going to be running solo, in an area with absolutely no other possible cause for electrical interference, then that is the only case where I would recommend a Spektrum.
Many folks claim that FlySky radios are the root cause, but I have not seen this personally, I have seen Spektrum glitches occur when no FlySky radio was in use.
Club Racer: SCT + eBuggy + Spec Slash + 17.5T Buggy + GT8e + USGT + VTA + 17.5T TC
Basher: Monster Trucks + Crawlers + Drifters + Motorcycles