Yeah, the "last gen" version of
Double Agent is more like prior
Splinter Cell's than the changes the "next gen" version had. The plots are different too, I think only the main kidnapping or whatever is the same.
demi's already got a good chunk of my "hidden gems" type list for the thing like Buffy and such, but a couple I like missing:
Oddworld: Stranger's WrathArmed and DangerousI preferred the Burnouts better on Xbox, cuz controller at minimum, graphics and stuff aren't too different. There's a couple of series like
X-Men Legends (especially 2) where the Xbox just has better frame rate or whatever so I'd add that to the list but if you already have it on PS2 or GCN it's probably not really worth it. (He says like these games cost much.) Burnout could go in that category, even their swan song
Black is barely different on PS2. Some stuff like
Mercenaries,
The Simpsons: Hit and Run,
Metal Arms,
Freedom Fighters,
NBA Street Vol. 2 
, etc. also fall into this "better on Xbox but fine on PS2/GCN" category as it's mostly just framerate and sometimes textures. Occasionally controller preference.
There's a handful of games where Xbox beats PC because PC is a PS2 up-port. But I never remember the list. I think the
Prince of Persia trilology might be like that. IIRC, even the PS3 collection is PS2 running at higher res, so worse textures, etc. compared to Xbox. One I remember is
Mace Griffin Bounty Hunter, less because the PC version is a PS2 port and more that it's a buggy mess and looks no better than the Xbox version anyway even at higher resolutions which are prone to cause the game to crash anyway. Fans have probably patched it up at this point, but the story about why it isn't on the transphobic GOG.com was because GOG looked at it and said "nah, not even gonna try to fix that garbage." I think it's also one of those PC games that freaks out at you not having a newer Windows version than 98 if you have a Windows version newer than XP.
Dead to Rights if you really like it on one console is worth owning on both Xbox and PS2 imo because it had a six month exclusive on it, and they used the feedback on the Xbox version to rework the PS2 one. I also like the first
Splinter Cell on PS2 for similar reasons, most notably it has properly set hitboxes on things like lights.
Return to Castle Wolfenstein is definitive on the original PC version, but if you want it for console, the Xbox is the way to go by far. The PS2 version has like all the levels cut in half, crappy framerates and two minute loading times or some shit.
