Clash of Super Heroes, was a launch title for the Dreamcast in North America. The game's purpose in the systems initial lineup was a means to showcase the hardware as a 2D powerhouse, being able to run the chaotic and frantic 2D fighter with an effortless develpment cycle with absolutely zero compromise made from arcade to home.
MvC1 is th 3rd installment in Capcom's popular Marvel Vs. series and the final entry in the franchise to run on the companies proprietary CPSII arcade board. The title saw a short window of exclusivity on the Dreamcast before it eventually made its way to Sony's PS1 system in an albeit fairly compromised fashion due to that systems hardware limitations. More recently, it saw a release digitally in a 2 in 1 pack (with MSH) titled Marvel Vs. Capcom Origins for PSN and XBLA. Unlike many Capcom 2D titles that saw digital releases on psn and xbla (HD Remix, MvC2, Puzzle Fighter), MvC1 is not based on DC code and developed by Iron Galaxy for Capcom.
The reason I made this post is because it appears MvC1 Origins is getting pulled from the digital marketplace and no longer be available for purchase by the end of the month.
Other digital Capcom titles that were also on dreamcast and longer available for modern hardware are Marvel Vs Capcom 2 and most recently Jojo's Bizzare advanture (the latter receiving no official announcement of its removal!).