Choosing and buying headphones

I've heard those 3 headphones before. I will say that each one is unique in terms of sound. 

If you are spending good money (whatever that amount is) to you, then you may want to audition the headphones in question at a shop before you buy. 

I can't tell you how many times friends of mine have been disappointed with their headphones. In the end, we listened to headphones together and they were able to make the right decision.

I have owned a number of Denton and Focal. I would choose Focal of the two. While it certainly depends on taste… I had to buy a big high powered amp to get Denon’s bass under control. Focal are easy to drive, well balanced and detailed… I think a very high quality safe bet to start with. Most of us end up with many pair.

Those 3 are great headphones. I own them and its good. Moreover, consider for other guys opinion too. Have a great day!

Yesterday I listened to hifiman ananda in the store. I liked the sound, but they are huge in size. You can't turn your head too much, they will subside. I also managed to listen to HiFiMAN HE5se, by landing they are much more comfortable than ananda, but the sound is inferior.

Massdrop may not ship these worldwide, but if they do, you should consider these:

https://drop.com/buy/massdrop-x-focal-elex-headphones

The Elex is a modified Elear.  I have not heard the other headphones you mentioned, but I have about a dozen headphones including much more expensive ones like LCD4, LCDXC, HD800, and Sony MDR-Z1R and the Elex more than holds its own.  It is very neutral, dynamic, detailed, and comfortable.