Hello.
Of course, the difference between them is huge, and not even fully expressed in price.
I assume you have not read the threads of these patterns, otherwise the conclusions would be obvious to you.
Look, there is a main thread about PAM968 VSF, and a GEN / REP comparison and I did a separate review. For the ZF PAM968, there is a model thread that has described all the advantages and disadvantages.
If all this is not interesting, I will give the final conclusion - ZF is worse.
Also, pay attention to availability. TD had problems with VSF PAM968 (Maybe not now), and ZF ran out of stock, most seem to be a month after release.