On my wrist I feel that they wear exactly the same.
As for the Classic vs. Maxi; here's what I can say as an owner of both: The Classic has stronger lume by a long shot; even though the Maxi has larger painted on markers, the Classic's smaller applied chrome surround markers just glow way brighter.
On the other hand, I really like the vintage style dial of the Maxi, but since the Classic is my only modern-style Sub homage, it adds diversity to my collection. Based on that alone I would say that the Classic and Maxi both put smiles on my face for different reasons.
You really can't go wrong with any of the 20 Atmos models. The fit and finish on each of them is fantastic and for a Squale in-house Swiss manufactured watch with an ETA 2824-2 priced at only $420~ they are certainly a steal and are priced well below what I think they should be worth.
For reference, here's some newer shots of mine:
And then wrist shots to compare the Nassau vs Squale size-wise