Differences between Watir Webdriver in Ruby and Splinter in Python for Browser Test Automation?

I've already used Ruby and Watir Webdriver for browser automation. It has many positive aspects, but it also has its own library, webdriver update delay and some minor issues.

What are the differences between Splinter in Python with them. As with their documentation, Splinter provides support for Chrome and Firefox, whereas Watir Webdriver provides IE support. What are the more significant differences?