Radio gear, core-rc or Spektrum

[littlened]

In this post...
http://www.oople.com/forums/showthread.php?t=92329
I'm having problem with a motor not running smoothly at low speeds.

I'm wondering if it's got something to do with the cheap acoms 2.4 ghz radio gear I'm using?

On the hunt for some new gear Ive come across these...

This from Spektrum
http://www.apexmodels.com/gbu0-prodshow/SPM3300.html

Or this from core-rc
http://www.apexmodels.com/gbu0-prodshow/CR151.html

Both are about the same price.

Which would be better in terms on preventing interferrence etc?