The PCR enzyme has an extension time of 30 sec per kb and is 80 times more accurate than Taq polymerase. In addition, you do not need to investigate cycling conditions when primers are longer than 20 mer (Tm value > 63 ° C).
Furthermore, compared to the conventional 3-step PCR cycle, there is less non-specific amplification / smear that causes troubles in gene amplification, transcription, and translation. And PCR time goes to 1/3 of the time compared to conventional 3 step cycle.
Also, in addition to peptide tag such as His, HA and FLAG, large molecular tags, GST and/or Halo can be with PCR. (the protocol will be up soon)