As Patcher does not give details on how he calculated these projections, it is hard to guess how he feels the consoles are selling in each region, but I guess he expects PS3 to outperform X360 in EU, and he expects US sales to be similar for both.
He has already stated he expects GTA IV to boost PS3 hardware more than X360, so that may also be a factor in his projections.
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As Patcher does not give details on how he calculated these projections, it is hard to guess how he feels the consoles are selling in each region, but I guess he expects PS3 to outperform X360 in EU, and he expects US sales to be similar for both.
He has already stated he expects GTA IV to boost PS3 hardware more than X360, so that may also be a factor in his projections.