On a recent LHR-JFK flight I got moved to a refurb AA 772.

I had 12A (I think), which is a forward facing seat in the last row of the J cabin.

It was a day flight, so sleep wasn't too important, but when I tried to nap I found that I couldn't get comfortable (I am a side sleeper).

While the storage space around the seat and the IFE were great, overall I found it more constrictive than a BA CW seat.

The pillow and blanket were of a higher quality on AA, the food and service poorer.

I would personally choose a regular BA CW seat over the AA 772 seat if sleep is important, a 747 UD CW seat would only make the decision easier.