I have done 3 emanage blue installs, a calum board install and two AEM EMS installs. My personal two cars have the AEM EMS. It has more options built in than about any standalone out there, as well as a TON of inputs and outputs to control motors or switches or read in external sensors or voltages. It is the expandability and included functionality that got me to go AEM.
NX2000"
AEM EMS 1600
AEM UEGO External Wideband
AEM 3.5 Bar MAP sensor
GM IAT sensor
GM Boost Control Solenoid
1999 SEL
AEM EMS 1600-U
Internal wideband controller
GM 3 bar map sensor
GM IAT sensor
GM Boost Control Solenoid
Brent