key transpose

I need to transpose an entire mix (instrumental, no voice), up half a step or a step. I have never used it before in WL.
What is the best way to do it?
I selected “complex mixes” from the pitch window.
But what about “correct formants” or “modulate formants”?
I also have Nuendo. Is the algorithm in Nuendo better or worse than WL?
Any help appreciated.

The best approach IMO is to just try out the different options and see what sounds best with your particular mix - maybe with just a small selection.