Are Daily games are better than standard games by any means?

In a real game of chess you can't look at a database, or spend 8 hours on the analysis board trying to figure out the best move in a certain position. Live games are better.

You're strong Leonardo....

It depends on how you play them. Some of the strongest players in history honed their skills by playing correspondence chess (which is what the daily games are). If you take the time to really analyze each move, use the analysis board, notes, and save features, and then go back through the game making sure your analysis is correct AFTER THE GAME. You can really improve your thought process and the depth of your analysis. 

Most people however, just play the daily like positional blitz. And if you do that you lose all sense of continuity for the game, and it is probably no better than blitz for your improvement. 

The analysis feature DEFINATLY helps you improve your chess

Live games with at least 1 hour per clock are best.

Daily games are a good way to develop an opening repertoire if you want to really study the typical positions that arise and get a good understanding of the ideas behind the openings.

Bronstein credited his correspondence play with his development of understanding of all aspects of the game. 

Which only makes sense. Taking a few hours to study a single position is going to provide far more opportunities to learn than spending a few minutes. 

From a neuro-cognitive perspective there is no question that dailies provide the most opportunity for skill development if the player takes the time to carefully and completely analyze each position. 

The real issue is that few people will actually take the time to do that. 

Some people don't have 2 hours + free one day but could spend over the day an amount of time playing daily games at OTB rythm3 minutes a move for instance

The question posed was not one about which method of serious play takes less time. The question posed was which method serious play is better for improvement. The answer is unequivocal simply because improvement comes precisely from improving one's ability to analyze deeply and correctly, and daily games give that opportunity in a way that 3 minute a move play does not. 

All learning results from the effects of spike-timing dependent plasticity. Which method provides for greater STDP effects is not really a debatable question. 

Is playing a game at 3-minute per move more effective than not playing? Yes. 
Is it more effective than playing blitz over the same time period? Yes. 
Is it more effective than spending similar time in deep analysis of a single position? No.  The didactic organization will be maximized when one spends the maximum time on the same task. 

That's just how neuro-cognition seems to work.