The 4pl uses and older version of FHSS 2.4gig spread spektrum signal. It does have more features though like ABS, a 4th channel on top of the third,EPA curve, channel mixing etc. With an SC10 though you wont use many/most of the added features. The DX2S does have telemetry, which on an electric rc will be useful for battery voltage and engine temps/temp warning.

ANother important feature, the SPektrum recievers can run on unregulated 2s Lipo batteries since it has a voltage range of 4.8-9.6 volts. This is a big advantage right here.

I race both of my SC10's and an SCTE using the 3 channel DX3S(I have some nitro vehicles I use with it as well)and it has everything needed for competitive racing or just fun bashing around the yard, and its range is excellent. The DX2S also can be had for $75-80 cheaper than the 4PL. With the money saved you can pick up a second reciever for your 2nd rc roller.