I would just go for it.

The first class Oasis seats certainly are less comfortable than the prior seats, however they’re worth it over the economy seats if it’s only for stickers. I just got off an Oasis flight in the exit row 17F seat from ORD - TPA and my back was absolutely killing me during and after. The padding on the bottom cushion is awful, the makeshift armrest is extremely misaligned on the window seat and it’s difficult to find a comfortable position, and weirdly enough they kept the tray table on the back of the seat, so it doesn’t extend any further than a regular one and there’s a big gap between you and the tray table.