I would vote the PFA's Popular Flying as the magazine that has improved the most over the recent past. However, it only covers the VFR part of the GA world which I think is a pity.
Both Flyer and now Pilot help my flying budget with their Free Landing Vouchers which I suggest have a greater benefit that just their face value. By this I mean they encourage me (and presumably others) to visit a higher number of different airfields.
I haven't voted because I think there are too many polls.........