Disclaimer: Some computer system may not be able to run these two videos properly. Make sure you close any background programs running a lot of memory and view this on a desktop to avoid fps drop, stuttering and other issues. Usually if you can't tell a difference you're either not looking close enough or your system is too slow!
Remember that 60fps not only looks better, but it also feels better to play with due to decreased response time, delay and less lag. Seeing it here is one thing. Experiencing it is another. Try another example! 30vs60fps.com