It may be a while before anybody come along who can really answer your question. 6A is not a steel commonly used by American knifemakers so our experience with it will likely be very limited.
Vanadium in the proper amount will help a steel form carbides, especially when chromium is present, and this is generally a good thing where knife blades are concerned.
Without knowing specifically what steels you have access to that is really about all I can say about it. Why not make a knife with both steels and compare them? You need only make the blade and sharpen it for testing. A nice finish and a handle can wait until your testing tells you which is the better steel for your purposes...
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