Sony had 3 things going for them: 1.The PS2 could play basically the entire PS1 catalog (which meant a large library available at launch and an attractive upgrade option for existing PS1 owners) 2.The PS2 could play DVDs (which meant you didn't need a separate DVD player) and 3.Previous Sega failures (Sega CD, 32x, Saturn) made it much harder for Sega to convince 3rd party developers to support the Dreamcast.