Mikuni will perform more forgivingly if your jetting is off. The downside would be that it wouldn’t “tell” you as clearly as the PHVA that adjustments should be made. Although by using the search and tuning spreadsheet you should be able to find more or less much where you want to be jet-wise with both carbs.
Also if you don’t upgrade from the original 14mm intake then you wouldn’t really be any better off with either over the stock 14 PHVA. (edited)