The page says to "please vote for your favorite master", so doesn't that make it a "master vs master" comparison and pick your favorite one?

I chose track #2 . Also track #4 sounds good but maybe with a little less dynamics...
For my ears the rest of the tracks are too boosted in the low end and sink the vocal in the busy parts.

stevec

Soundwise

hueseph
if you had taken the time to match volumes you would have found that the transients were in fact more prominent in 2 and 4.

You can tell that just by looking at waveforms as well.

Exactly.     
 
I was listening on headphones, at work.  Level matching simply wasn't an option....    However, it was a real-world/outside the studio listening experience, as 99% of the target audience is likely to do.   
 

As a consumer, you turn up your player to a comfortable level. As a critical listener you should do the same for each individual track. Even then, you stated that you found the transients in 2 and 4 to be muted when clearly this is not the case.

hueseph
...the thwack of the snare is crushed into oblivion...

 
I find the snare drum in the choruses to be really irritating. The snare is least prominent in #1, so that's my favourite, even though it may fall short in other respects.

Very subjective to the individual. 
 
It sounds to me as if track 3 has had a more personal touch which I like. If it happens to be a LANDR track then I guess I've been LANDRED :)
 
 
To my ears it sounds like there has been personal attention to the bass and bringing out the mids. Like the mix has some human elements to it. 
 
 

I liked #4. 

I liked version #3 the best.
#6 was my second fave, edging out #5 by a little bit.
 
 

Since it's open kimono time, I voted for #3 and commented (in the poll) that #5 was my second fav.

Another vote for the pre-master.
 
A very subjective test.  I'll be interested to find out which master was which though.

Close your kimono dude! Ha!