Should i choose 2.x or 3.x - Confused

I would recommend CI 3.0 dev.

The upgrade when the release comes out will be a matter of replacing a couple of folders (system) and updating a few small bits (sessions).

The upgrade path will be much smaller and much simpler.

I have switched my new work to CI 3.0. The upgrade from CI 2.2.0 was simple and straightforward, but a little fiddly.

The new function in CI 3 will be definitely worth the effort.

Go for CI 3