Originally Posted by sosidge
HRS version will have an HRS receiver. PCM version will have a PCM receiver.
HRS requires digital servos, preferably Futaba. PCM receiver will work with everything.
So it depends mostly on what servos you currently have/plan to get.
Not actualy true HRS will work with any servo, but to get the best of HRS use digital servo's (works great with Hitec HS5925)