I like row 6, since you get to board early (if not elite) and deplane right behind F. The last-time I sat in row 6, the F/A gave us water prior to departure, since she had the cups on her tray after serving F. That said, curtain between F and Y flapping around can be annoying if you are seated in 6C or D (I still think the curtain serves no real purpose). As for 17A/F, it does have more legroom compared to row 6, although some people claim the seat cushion is less padded.