i have 2 trex 150 models , if i buy the latest flybarless system will it be compatible to perform atitude control and perform stability control?

yes the latest ones will work and they will provide great flight control to your 150. there are two avaliable depending on the type of transmitter you have.  if you use the HEG15004T version you will be able to use spektrum transmittersand Futaba transmittersif you use the HEG15005 version this will allow for the Align A10 transmitter