Actually I think the PSN version is always NTSC, regardless of where you are.
I play this game on my PAL PS3, but since it was downloaded from the PSN store it has the American title "Goin' Quackers" instead of the European (and arguably better) title "Quack Attack".
@Marsh_GL But your runs shows "Quack Attack" on main screen, meaning that it's the PAL version
I've said some time ago I was gonna test the PSN release but never done it. The reason why PAL PSN has more runs is because PS2 version was released for PS3 only in PAL regions and PS2 games released on PSN have faster loading times than a PS2. I have an English account so I may buy the game to test it in my console and see if it gets displayed at 50 or 60hz. Back in 6th gen days PAL games began having the option to run at 50 or 60hz, and the titles that don't included that were sometimes optimized to be a bit similar to 60hz running at 50, and sometimes they were not optimized
I assume that PSN gets displayed at 50hz but since I haven't played the PAL PS2 version I can't say something about that. My tv supports both 50/60hz images so that shouldn't be a problem
Another thing to mention is that PS2 is CD based, and CD PS2 games uses to have slower loading times. And as I've said before, PS2 games released on PSN uses to load faster on PS3 consoles, making those release a bit faster in loading times
The PS2 version did actually get an NTSC release on PSN but it was only in some East Asian countries such as Hong Kong and Korea iirc.