I've shot a ton of WWB--many thousands of rounds.
I haven't had any experience with PMC practice/range use ammo recently, but back when I was shooting it on a fairly regular basis, I can't say that it impressed me as being noticeably superior to WWB.
Early in my shooting career I was convinced that there was a big difference between the different types of practice/range use ammunition on the market, particularly in terms of how accurate it was. I finally had to give that up the day I was in a rush for a match and ended up shooting it with some Chinese steel-cased 9mm that I had previously written off as good for little more than making noise. It shot just fine and to the extent that I did poorly in the match, I couldn't blame it on the quality or accuracy of the ammunition.
Since then I've tried doing things like shooting groups with a mix of different brands and types ammo. One day, for the fun of it, I loaded a magazine with a mix of all the different types of 9mm I had on hand--some cheap range practice ammo, some JHP self-defense rounds, probably something like 4 different brands--and shot a group with it. It wasn't spectacular, but it was a perfectly acceptable group--pretty much what I would expect to get with the gun I was using at the time even shooting only one kind of ammo. I will caveat that by saying that, as I recall, all of the ammunition was loaded with 115gr bullets. I doubt that the results would have been as nice with a large range of bullet weights. That aside, the point remains that not only was it all reasonably accurate, it all shot to more or less the same point of aim.
I've heard a lot of really stupid things said--and some outright lies told--about various types and brands of ammunition from behind the counter of indoor ranges. I recall standing in line at a local indoor range while the owner's idiot son convinced the person in line in front of me that it was a bad idea for them to shoot steel-cased ammunition in their AK style firearm so he could sell them some ammo from the range's overpriced inventory. I'll wager that well over 90% of all AK rifles never have anything OTHER than steel-cased ammunition put through them and, of course, they work just fine with it.