Which is the best audio magazine?

Like David said, dailyaudiophile.com is the best source. The page compiles all the information from magazines, webpages and blogs dedicated to audio. 
I also like to read STEREO, a German magazine that is distributed for free, in English, via email. You just have to subscribe. 
TAS and Stereophile are classics that I follow and I personally hate the British magazines - some love them. 
The magazines from Hong Kong are simply fantastic (maybe the best) in terms of contents, but you would need to read in Chinese. 

I agree with the poster who said none.

The best ever was probably Peter Aczel's The Audio Critic 
http://www.biline.ca/audio_critic/audio_critic_down.htm
Hugely controversial unsurprisingly, much vilified but never refuted. It took me ages to accept what I was reading and even now I want to resist. However it's the only one that has stood the test of time for me. All the others I have read were mere entertainment, nothing more.

However there is one UK magazine Hi-Fi Critic which purports to be free from bias (I doubt it) and advertising (which can only be good). It's still not hard hitting enough for my taste but you can a flavour of it here, https://www.hificritic.

Or you might prefer one of the broadcast publications if you're happier with a more accurate and factual but drier presentation.

Peter Aczel? OMG! Whoa! You have got to be kidding!

What ever happened to Positive Feedback? 

+1 cd318! The rising tide of b*ll s*** of today’s audio scene is appalling! "I am an audiophile and am looking for a power cord to take my system to the next.level" LOL! "My new AC receptacles sound better after they have been burned-in". LOL!!!

What passes for audio reviews these days is the equivalent of pornography - and is nowhere as much fun!