I believe that the UA BF seat is roughly equivalent to the BA Club seat as far as comfort. The BA window seats offer more privacy for sure, when the partition is up. The BA aisle seats, however, have a more open feel than UA's and for me that was a negative. The IFE on UA is superior in picture quality.

I certainly would not opt for an extra connection so that I could fly one over the other - the risk of a misconnect trumps everything else.