Boo-Yeah, PS2.

Sony's PlayStation 2 accounted for 42 percent of video game console usage during June, and PC gamers played World of Warcraft more than four times as much as any other PC game, Nielsen reported today as it launched Nielsen GamePlay Metrics, the first service of its kind to electronically track video game console usage and games played on PCs.
68.1 million individuals used a video game console in June, playing an average of 7.5 days during the month. On the days they played, Xbox 360 users logged an average of 2.2 sessions, with an average session length of 61 minutes. In contrast, PlayStation 3 users' logged an average of 1.9 sessions, with an average session length of 83 minutes, on the days they played.