emanage blue can control fuel air mixtures and ignition timing. the ultimate does the same thing, but has some more features. such as data logging, knock sensors built into rather than having to buy add ons for the emanage and the ultimate comes with support tool whereas the blue emanage doesn't. you have to buy it. thats about all + less people are familiar with the ultimate, i had problems at first becasue ppl that knew how to fit the blue emanage had dramas with the ultimate. if i were to do it all again. i would have stuck with the blue emanage more ppl have had more success with the blue one. and it is half the cost.
but i have spent the money getting the ultimate working now so i will stick with it