Zhidong She <zhidong(dot)she(at)gmail(dot)com> writes:
> We have a debate internally on choosing 8.4 or 9.0 as our product
> backend database.
Well, if it's about stability, a look at the commit logs will convince
you that 9.0 and 8.4 branches are now about on par for bug fix rate.
Since 9.0.4, I count 34 non-documentation patches applied to the 9.0
branch, and of these all but three were also patched in 8.4. Of those
three, one was in a feature not available at all in 8.4 (walreceiver)
and the other two were very minor bugs.
regards, tom lane