ORIGINAL: GBR2

If you really need 12 channels, why are you even considering the 9 channel x9303?? Your real question seems to be which 2.4GHz scheme is better. They both have their strengths and weaknesses. You really need to do a lot more reading to make your own judgement which you think is better. Opinions on the subject abound in lots of forums. Read them and make your own decision.