Shall I use Rails 4.x.x

Hi, I'm using Ruby 1.9.3 for programming. I need to update Rails 3.2.6 to 4.x, which kind of version is comfortable with Ruby 1.9.3?

I think it is easier to 4.0.6 at first moment.

You can compare versions and to study the differences looking the diff: http://railsdiff.org/

Rails 4.0.8 to get last security patches

Why? Current is 2.1.x., and 1.9.3 will EOL soon (February 2015).