There's no equivalent to AA's MCE, unfortunately, all the economy seating is basically the same and the only status benefit is, as mentioned, free seat selection ahead of the non-status passengers.

For extra legroom you'll want to select the emergency exit seats, or, alternatively, on short-haul flights operating on an A320neo you'll want to select a seat in row 12 or further ahead, or on an A321neo, row 14 or. Aft of that you'll have the uncomfortable budget airline slimline seats.