I don't have the PF's, but have admired them for a while now. While there are a lot of similarities, this one has a different leg forward, no knee up, looking the other direction, is fully sculpted, 1/6 scale instead of 1/4, much more vibrant colors, in a line that will include more figures than (apparently) just the 3, and about half the price. I think those are most if not all the indisputable differences.
As far as preference, I definitely agree that TH's are more 'comic-bookie' which is an aesthetic that I prefer. Also I enjoy the head sculpt on this a lot more. The biggest nitpick I have with PF's is that Superman and Batman look old and not very 'handsome'. The SS PF Superman looks like he's in his 50's to me where this one looks like he's in his prime 30's. I've always thought Clark and Bruce were supposed to be handsome, but there are many interpretations where they are just 'gritty' and almost ugly. I also don't like the not so great fitting underpants and PF Superman. Then there is the leaning issue. Obviously the cost issue is important as well. I will probably be able to get the original 7 JL for just a little more than the 3 PF's, not to mention be able to display them all at 1/6.
Given all that, I can see why even owners of the PF's might want to build a collection of 1/6 TH Super Powers statues. We haven't seen Batman yet, so the only one so far that resembles the PF's is this one. And one final thought, even those this resembles the PF, how many different poses would a Superman Statue have? Everyone wants an iconic pose, so it's this, a floating like upcoming 1/3 P1, or a flying pose. There are only so many realistic choices. Look at just how many Batman statues there are of him standing on a Gargoyle, and people continue to buy those up left and right.
