A comparison is presented between two improved relay techniques, the Two Channel Relay and the ATV(+) identification, recently introduced to obtain more information about the process and therefore to improve the closed loop performance. The techniques are briefly described and the comparison is stated in terms of duration of experimental tests versus achievable performance. From the analysis of a large number of cases, the ATV(+) method shows to give better results, because a parametric model is identified and a more accurate tuning technique can be employed; the corresponding experimental times are about twice longer.