I picked my freq just based on what channel other guys fly at my club. I watched the freq pin board for a couple of months after I joined, and picked a freq that no one ever used.

However, if you could pick any channel, hear are some things I thought about...

Futaba RXs are center tuned to high and low bands, so if you pick the channel in the dead center of those bands, you'll likely eek out a little more sensitivity. Most other brands of RXs are going to be center tuned in the middle of the band, so picking the center channel freq of the entire band would put you dead center. The idea here is that you're picking the channel that the RX is factory tuned to, instead of sending your RX in to have it retuned to a channel you selected.

With that said, I doubt most fliers would be able to notice a difference, and I've even seen guys fly Futaba RXs tuned for high band fly with a low band xtal in them without a problem.