Hello, which polymerase you should use depends on what you want to amplify. If you need accuracy the Pfu series works fine, If you want to amplify large fragments (i.e. 5 kb or more) you may use a mix of Taq and Pfu polymerases. If you want to amplify standard-size fragments and accuracy is not so relevant, the best choice is Taq. Regarding brands, we use Taq Polymerase recombinant (Invitrogen) and Pfu ultra II Fusion (Agilent).