AEM versus Dynojet Wideband issue?

[vortech]

Hey guys-I have 2 widebands. 1 is the Dynojet wideband commander that is perma mounted in my car and the other is a AEM that I use to help people tune there cars. One thing that I notice is when i log the DWC the graph is pretty smooth-the AEM however is very erratic-hills and valleys everywhere.
I tried a NGK AFX wideband it was also smooth like the DWC. Are all the AEM's like this or does this mean the AEM is logging more or less data or is maybe a sensor going for a poop?

thanks!

[EC_Tune]

Could be the sampling rate &/or smoothing functions inside the wideband.