That's tough. Atari I haven't experienced much besides compillations but with Lynx/Jaguar the few from Atari 50 was a good experience.
For Sega/Xbox though hmm not sure. Gimmicks wise Sega has it there for sure with Dreamcast VMU or Sega CD and 32X, regardless of good or bad they are options.
For games it's tough, I see a lot of good Xbox OG games and go yeah they are interesting. While Sega a lot of unresearched potential I'd say it has over it. Really hard.
I consider niche games more than obvious IPs as to me the deeper it goes the better you know ok this had a lot going for it.
Like to me seeing the not talked about as much games or ones I missed Xbox OG/360 is like wow, I really like what's offered here besides the obvious where they are good but eh, pretty obviously good but I don't care as much anymore for some of them of IPs.
That and if it's just off the obvious games and very few, that's not a strong argument I think, the lesser stuff I think has enough weight to determine that and I don't go off nostalgia, even then I didn't experience much of the OG Xbox, did more 360 and even then I still have yet to get around to like any gen tons of IPs I missed, some obvious ones I've only gotten around to later.
While I haven't experienced a single Sega console only compilations there too but am always impressed with what Sega did with games and hardware despite that.
While the exclusive 1st/3rd parties for them mostly 3rd parties I'm like wow these are excellent.
If by gimmicks yeah Sega, the memory cards and white/black buttons, SmartGlass (remember that) or impulse triggers are cool of Xbox over the different gens but not much. Even if not counting VR/other aspects Sega/Atari had and never made happen still would put them over with those if they did release and flopped because they would be cool still in some way regardless in my eyes, Virtual Boy is, Wii U is, the potential and what did happen was still compelling to me. Even some of the worst consoles by any companies still had appeal I think of hardware/games execution.
Saturn/Dreamcast clearly have interesting libraries. Genesis is obvious of what's there besides a lot probably I have yet to uncover. Master System/Game Gear sure.
Sega has a wider range of IPs though hmm.
I'd probably say Sega even besides the potential I don't know of besides what I've researched.
