That is like asking which is better, Coke or Pepsi. You will get people adamantly in favour of one and opposed to the other. Then in the middle is the larger group who will drink whatever you serve. The aircraft is only one factor in how passengers decide about the service of an airline. To the airline the popularity of a particular aircraft is only one piece of the puzzle. More important is do they make money. To the passenger the fare is sometimes the most important thing.
Forums like this with aircraft enthusiasts or frequent flyers, are a segment of the traveling public and an even smaller segment of the populations at large. If an aircraft is bad enough to cause people to stop buying tickets or avoiding certain flights the bottom line of the airline will speak very soon and that aircraft will go bye bye. The whole public may lament AC
getting rid of the A340-300 and A340-500, however unless they stop flying the airline the better economics of the 777 that they have gone with will win the day. Turns out passenger surveys are positive.
I love flying period. Beyond that I am a definite size queen and love flying the larger aircraft. I liked AC
's A330/340 over the 767's because they were newer and more comfortable. I prefer the refurbished XM
'd 767's over the A320 family. I perfer the CRJ over the Dash 8-100/300. I love the 777 when it isn't 10 across or with cramped pitch. I abhor the windows on a CRJ 100/200 and the older version of the seats, but will choose a direct CRJ flight over a connecting larger aircraft. It really isn't rocket science.
I have never flown the A380 and it will be a long time before I get the chance. I don't particularly like the exterior but the interior will have more of an impact for me.
My two favourite all time aircraft has been the 747 and the L1011. However, when some airlines crammed additional seats into the back it didn't matter it was a 747 or not - I hated it. I never flew a Transat L1011 for a couple of reasons.
So I am not blindly favoured to one company over another, but more so favoured to the airline configuration. This is not comparing companies setups or styles which I definitely have a bias, simply the experience of the individual aircraft.