I read 'Piano' from Rhinegold, which is good, 'International Pianist', which is great, and 'Pianist' which is my favourite!
If I could get a subscription, I would choose Pianist over the others any day - although the articles are fascinating in 'Piano' and 'International Pianist', for me it is the fact the 'Pianist' has articles of interest
in addition to articles from leading individuals on technique, how to tackle a particular problem that crops up in a certain composers' works (for example), how to approach the LH fingering in this piece, different ways to use the pedal to improve colour on that piece, notes on repertoire, choice of pieces when putting recitals together, venue reviews - lots of things that directly relate to the active pianist and that are not just of interest, but can also be applied to your own playing ... like a monthly masterclass packed with extras!