Which airline would be the best option for a London to New York flight in economy? Have the choice of United (767-400), Brussels (A330-300) or Lufthansa (A380-800) (United is direct, other two via BRU or FRA, not bothered about an extra stop if the product is more comfortable)

Have Brussels refitted their A330's recently? I had read they had increased pitch to 33" (vs 31 on United?) but then had also read reviews from 2015 that say their seats are uncomfortable?