Popular Flying and Microlight Flyer (through membership of PFA/BMAA) are always good.
Loop is OK as it is free.
The newstand mags tend to be very similar , not surprisingly, in terms of news and articles. All product reviews seem to be increasingly extended adverts.
Todays Pilot is current subscription but the others are bought either for a specific article or more likely the free landing vouchers.
ps Pilot still seems to have the most active classifieds