"GFN-WR" is a misnomer now for a few years since GIMPS found the new world's biggest, that's what DYFL is for. The front page shows you predicted world position for each project.
The GFN-WR Project is now called "Do you feel lucky". The largest prime found by GIMPS has 24862048 digits. If we were lucky enough to find a (GFN) prime running tasks from "Do you feel lucky", it would be the largest prime ever found.
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Posted 219 days ago by Usucapio Libertatis
Lame answer (someone else will be able to provide a better one):
The higher the number next to GFN, the longer it will take to complete. From a few seconds on GFN 15 to several days (or even weeks) on GFN world record.
The latter name means that if a GFN WR candidate turns out to be prime, it would be the largest prime number ever found.
PPS and GFN have the same purpose: find prime Numbers. They use different software (although both run within Boinc). PPS is currently CPU online while GFN runs on CPU or GPU.