2.25" Advantages (Ardents, Crossmarks) are bigger than 2.35" High Rollers, Larsen TTs (Minions, Ignitors, Swampthings), they're the same wort of size as 2.5" High Rollers (& Minions). The tyre carcass I reckon is a bit bigger than the carcass/air volume of a 2.5" HR/Minion, just that the chunkier tread on a 2.5" HR/Minion makes them about the same overall volume (width & height)
2.25" Advantages really need pretty wide rims to get the most out of them though, they've a pretty round shape (the side tread isn't massively tall), so at higher pressures where they roll better, they don't corner that well. At lower pressures where they corner and grip reasonably well they roll really quite slow due to the width of them, and not having fully ramped tread
Mavic XM719s (19mm internal, 24mm external) aren't really wide enough for eg
Whereas 2.35" Maxxis will run normal XC tubes fine, I've found the extra size of the 2.25" Advantages really makes the tubes have to stretch to make them fill out the tyre and they'll pinchflat quite easily, I was running 50/60psi before getting some Maxxis 1.2mm FR (300g) tubes. They actually fill the tyre without having to stretch loads, so I can run them with sensible pressures now
I saw a shop built SC nomad with a 2.4" advantage once, it really was huge, quite snug with the fork brace on the RS lyrik fork. It had a 2.25" on the back so I assume the 2.4" just wouldn't fit
I love them for straightline fast rocky stuff, the big volume is great