While Capcom fighters have always been easier to find (with many Street Fighter releases going back to the SNES), SNK titles tended to be every bit as good and sometimes better. Naturally, these 2 companies had to pit their characters against each other sooner or later, and the results are a mixed bag.
Dragonsama of the Penny-arcade forum offers a history and tribute of these games, going from the silly chibi card battles on the Neo-Geo pocket, to the graphical delight of CVS2, and ending finally with the last game ever on the Neo-Geo MVS.