The older version, 3.2, should be more stabler but it may be worth the slight risk to learn 4.0 from the start, as that will provide you with newer feature over

The older version, 3.2, should be more stabler but it may be worth the slight risk to learn 4.0 from the start, as that will provide you with newer feature overviews of the framework. If you do have troubles with 4.0, you can ask and find answers on StackOverflow or the #rubyonrails IRC. You may also help by reporting any errors or bugs in 4.0.