depends on what you want ...
ez connects to map sensor and bus connector and disconnects without a trace (read warranty friendly), lower power increase than the comp or regular pe .
pe connect to map sensor and pricks pump wire post electronics , big power gain . but a warranty voider and is dectectable in the ecm , so i'm told ...
comp is ez and pe rolled into one , not as big a power gain as the ez and pe stacked , but more adjustable and can be turned off completely , where the ez is always on .
all the above technically viod your powertrain warranty , if you get caught that is ... lol ...