Tec2 or 3 goes along with the factory ecu. so you can retain factory options. Like the alarm and all the other nice features. I don't know much about the motec setup. I'd go with either one if I had the cash.

06 GMC Sierra 2500HD Dmax/ally 06 Pontiac G6 GT 05 CRF250R FOR SALE 06 KX65 with riding gear $2700 obo