The Airbus's are designed not for optimum quality but to sell....period.
Let me know if you want an in-depth observational experience, not statistical, explanation for what I've said.
I am comparing the anecdotal evidence of the record of the A320 (puechased by govt owned Indian Airlines 20+ yrs ago and many still flying) with the 737NG's flown by many private indian airlines. Also from some data i get from a.net and airdisaster.com etc.