i think these days with tuners having better technology to play with i would say there both as good as each other,the problem for tuners with less toys to play with is that ofac has a boost limit of 1 bar (14.7 psi)....the ofab doesnt...this 'could' be be a reason why ofab is generally known to be better.... hope this helps and if ive said some thing not 100% right that some one will correct me...