New branch. Headed for RTM. Generally speaking the later build will be better, but as you can see you can have a problem with a new build that wasn't there for you in an older build. Depends on what you do and what programs/hardware you run. Only way to really know is to try them out. These are test
builds after all. If you have space on your HDD, I'd recommend creating another partition and dual booting. Then you can try it out without losing anything but some time. Info here if needed: Dual Boot Installation with Windows 7 and Vista
This is for Vista and 7 but same steps. If you have questions, you know where to find us.