Sega's final console and Microsoft's first; both 6th gen systems that failed to capture a large audience but nonetheless had a dedicated following.

Which do you think was the better system, and why?

Xbox's best games are from SEGA. Dreamcast all the way.

Dreamcast of course most of the best games are from SEGA but it also has a ton of shmups. Best version until this year of a console version of MvC2.  We all know about Ikaruga but also Cannon Spike or Psyvariar 2. Mars Matrix. Then of course NAOMI the arcade board of DC. Fans have ported some of those and of course Atmoswave. PSO the first console MMO and fans keep it alive to this day. Fans still make games for DC. I like Xbox a lot but DC just has insane library and support for fans. Not to mention it's one of the most innovative consoles ever.

Uhhh, must be Xbox because of HALO, a true killer app. What say you Curl? Your the OP.

Xbox for me. Ironically some of the Xbox’s best games were from Sega including one of my favorite games ever with Jet Set Radio Future.

But Halo CE truly being a killer app that led to endless LAN parties, then Halo 2 taking the LAN party experience online, adding my introduction to Elder Scrolls series and golden age BioWare, and Fable, Xbox had some great games.

I also really enjoyed other great FPS titles like Half Life 2, Unreal Chanpionship, and Doom 3.

tbf Dreamcast was discontinued a little over a year after launch (9/9/99 -> 1/31/01), whereas Xbox had the benefit of an entire generation (as well commercially successful hardware). For as long as DC had, it's pretty impressive what Sega achieved. I'm admittedly not too far informed on software beyond SA1/2, though I have only heard overwhelmingly positive things.

Dreamcast for sure.

Bottom line: Xbox 1 had better games than Dreamcast. MS outplayed Sega, and that's why Sega stopped making consoles.

DC was launched in Japan in 1998. The last official DC game released in 2007.

First sentence is a subjective opinion. The second line is objectively wrong. You don't know anything about the history of SEGA clearly.

Yeah, I do. Hell, I bought a fucking Sega Genesis back in 1991.  What makes you the expert of SEGA history? Enlighten me.