It totally depends on what you are looking for content-wise and what you want or don't want out of a tracker.
Anyway I don't really know that much about GFT, I was invited there a year or so ago but never used the site since it was basically redundant to other trackers that I'm a member of.
PTN is a decent movie site that's always trying to improve and has very involved staff but it's heavy on the community aspect so if that doesn't interest you then there are maybe better places to look into.
If you are just looking to get into whichever tracker you think has the most cache then just forget about it entirely .
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