The surveys on the forums just turn into "fan's" getting other like minded to vote. I think the best thing you could do is go to huge events and require that info on registration. That would be interesting. It would also show you what the airplane guys use, VS heli, VS sailplane. The events I go to around here - Spektrum and JR dominate. Followed distantly by Futaba and then Hitec. Airtronics (bigger among the sailplane crews I have seen like 3 of - ever). I used to be Airtronics exclusively. My club reflects that with largely Spek/JR then Futaba. I think one guy flies Airtronics and 1 or 2 on Hitec. The 72MHz holdouts are still largely Futaba.
If you could get the entire site population of RCG, Wattflyer and RCU to vote - rather than the very few that do surveys, that might be legit.
What is most important is - we all have a choice and it does not really matter what is popular as long as you are happy. Ford VS Chevy.
I drive a Honda.