9.0 has LOADS of bugs, at least for me. Which is the reason why i uninstalled it almost after getting it, pointing out that none of my plugins wouldnt function on it.
If you have a lot of ram and a x64 OS, then use 8.1 (64-bit version of 8.0), because it massively raises your rendering speed, rather than 9.0 64-bit, because it has no bugs at all.
If you don't have a lot of ram, use standard 8.0 pro, way better than the 9.0 32-bit.