So ....

A delixe is smaller than executive but costs more for $. The online descriptions for superior, deluxe and executive are identical except for the square footage number.

This means you either go Exec (for space) or Deluxe on the basis that those rooms should have better amenities to justify the 10% cash difference over Exec / Superior.

I booked an Exec but may change as I realised they may just give me Deluxe anyway as an AMB upgrade, even though I want the extra space!