Cool, so do your estimates have either of them breaking 90m, and do we know if PS3 has passed 360WW?
Xbox 360 shipped 83.7m as of March 2014.
PS3 shipped 71 million as of March 2014 (excluding FY2012)
In FY2012 we saw 16.5 million units shipped between PS2 and PS3. If the PS2 sold in the same amount it did during FY2011 which was 4.10m, then PS3 would have shipped 12.4 million which takes PS3 total to 83.4m. But of course the PS2 would have seen a decline over that 4.1m number and so we can state that PS2 shipments were less than 4.1 million (as evidenced by FY2010 to 2011 decline) and PS3 shipments must be over 12.4 million.
So with one year less on the market the PS3 has matched and potentially exceeded 360 sales. A market research firm that I get data from confirmed that the PS3 install base is higher than the 360 install base worldwide.
As of today, both are around ~88 million and will get to 90 million before being discontinued. Despite the higher price, the PlayStation 3 will have shipped more than the Xbox 360 once all is said and done.