Microsoft offered a 3 years warranty. So most consoles that broke where covered and got either repaired, replaced or even both.
While I believe that many people would rather just buy a new one than pay for the repair, I don't think that many would just ignore the warranty.
On the other hand, many early PS3s broke due to YLOD and that only recently (a few years ago). None of them where covered.
Now you have lots of broken 360 where a high percentage was covered by warranty vs. a lower number of broken PS3s that had no warranty left.
They probably offset each other.







