So let me get this straight: Three years ago, that poll said that PPGD was the more popular comic, but since then, GT has lead by about 16%. I think I have a theory as to why this is so. It was about three years ago that Megaville was introduced into GT, right? Thus creating the misconception that the two comics related. Whenever I first started read the comics, I started with GT first, but read only a few pages of PPGD. However, I almost didn't even bother with PPGD, because at the time, I thought they were connected, and thus I thought "why bother reading PPGD if I knew that it was just gonna end with them dying?". Thank god I decided to read PPGD anyways, and did the research to find out that they were in fact, NOT related.
But my point is: The fact that GT appears to be the end result of PPGD, could be turning people away from PPGD, as a sorta "why even bother if they're all gonna die anyway" scenario. That's my take on it anyway.
I have to say, now more than ever, I really fucking glad PPGD doesn't end in GT.