It depends on how technical you are and/or how much you are willing to spend identifying and reporting bugs in the beta software. If you are highly technical with programing, Linux, etc. and are OK dealing with some bugs OH 2 is the version for you. If not OH 1.8.2 is the distro for you.
OH 2 is becoming pretty stable and usable but is still a ways from a stable release. But, OH 2 should be completely compatible with any configs and rules you create in OH 1 so any work you do in OH 1 should port unchanged to OH 2.