ORIGINAL: B58
Only downside on the 9c single channel ops is that the trottle trim is digital, so if you must do an emergency shutdown you have to wait for it to beep down. The 10X of course has manual trim on throttle. Just my 2 cents.
The best you can do on the 9C is change the amount of trim for each click. At the max setting, you can move through the full range of thottle trim in just six clicks.