I will say that as a solo traveler I prefer reverse herringbone seats (similar to what AA currently has and just announced today) over staggered forward-facing seats (like Polaris or DL suites). In the former, half of the seats are superior for a solo traveler (all the window seats), whereas in the latter only a quarter are (every other window seat, i.e., odd numbered window seats in Polaris). Of course, the latter is slightly more dense than the former, but I'm happy to accept slightly increased density if it means marginally more discount J or (gasp) upgrade space.
This is a generic comment about the base seating configuration type, rather than about the specific finishes or specifications an airline might choose to make the seat more or less spacious or luxurious.