TurboTweek!!!
I've never had any other chip, so i can't say how any other brands perform, but I will say this. When I first got my hot-air, it ran like crap... imagine an overweight 3 legged 20 year old dog with hip problems, and you just imagined something that would embarass my car in a race. I converted to the 86/87 ECM with a turbotweak chip, and the difference was night and day... mine may be an extreme case, but all I know is i am VERY VERY satisified with the chip he burned for me, and definitely reccomend him to anyone looking for a hotair chip.