Ok. Which is superior ?

I cannot speak for Floyd fanboys in general because at least outside this board, I know this opinion which I am about to state is not necessarily very popular among Floydians.  But I personally never saw the fuss about WYWH.  I mean it's a very, very good album, beautiful melodies and all but I never saw it as the undeniable masterpiece it is often made out to be.  And I really don't like Floyd moving out of pyschedelic noise and trying to write structured blues 'jams' (I put jams in single quotes exactly because it's way too structured to evoke the feeling of a jam).  And then the second part seems to be trying to evoke jazz rock/fusion and it's even more boring for me.  If I wanted a blues jam, I would listen to Allman Brothers.  I would listen to the wonderful Gary Moore-BB King jam on Thrill Is Gone that's up on YouTube and which every lover of guitar should listen to at least once.  If I wanted JR/F, I would listen to Mahavishnu or RTF, even Di Meola solo.  Floyd comes across as too tame when they attempt this.  Actually, much more so than DSOTM, it is WYWH which comes across as gateway prog for me.  Like In Absentia era PT, it is very comforting and melodic, and also very safe.  And the longish lengths make it feel like it's prog but it's only about as prog as Child In Time or Stairway To Heaven.  So overall, no, I prefer the succinctness and punch of Dark Side anyday.  Lyrically too, there is a lot of waxing over Syd on WYWH which is nice but also lacks the broad sweep of Dark Side as well as the latter's more bitter outlook.  Notice how many songs on Dark Side concern death or a path that leads to death.  Lyrically, Dark Side is way more hard hitting, at least for me.  

Hard hitting lyrics is the chief attraction of Animals.  And the concept overall is very coherent too which does make it a much harder choice between Animals and Dark Side for me.  But musically, I find Pigs VERY rambling and Sheep too a little rambling with Dogs being the only one that works in totality for me.  So again, the brevity of DSOTM works for me.  Basically, I don't think Floyd should have attempted epics or mini epics after Echoes.  That was their best and they were never going to top that.  I am sympathetic to Animals because Floyd came out swinging with all these long tracks in the peak of punk and because the lyrics were too hard hitting to be dismissed as airy-fairy out of touch prog, critics were put in a fix.  But as an overall listening experience, no, I still don't think it gets up to DSOTM.  

The Wall comes closest until it falters a little towards the end.  The problem with Wall is every song is wedded tightly to the narrative to the point that the ones towards the end like Trial do not work outside the context of the concept. Whereas on Dark Side, the concept is broader rather than being about a specific person's story and the songs standalone have a lot to say. 

I kind of doubt they put together DSOTM wanting to make WYWH all along. 

Nah, WYWH was the one they made when they were burnt out after the success of DSOTM.  And it shows. Also the beginning of the Waters-isation of Floyd.

Exactly my thoughts. Their most by the numbers album of the ones from Meddle to Wall.

Thanks.  And for me, Dark Side was my introduction to Floyd so that may be a part of why I am more attached to it vis a vis Animals.