Can any one reply me which of the javascript frameworks are better to implement on my project? jQuery or Mootools?
It's a matter of what coding style do you prefer and can help you in the long term. Just because other people use jQuery doesn't make it any easier for me to learn the way that it's coded.
This is a must for you to read before you go any further: http://jqueryvsmootools.com/
MooTools has the better API and once you actually use it, you'll see how the design choices make sense.
Try them both, but you'll stay for the extendability of MooTools
In the last performance comparison I know of, jQuery beat MooTools on IE, and they were head to head otherwise. Of course, one year is a huge lot of time in Javascript, so that says little about their current speed.
Anyway, unless you are really sure Javascript framework performance will be important for you, I would recommend jQuery, which has clearly been the popularity winner (see eg. Google Trends), which means better community support, more eyes and more developers in the long term.
Go with JQuery, it has the most active development community. Even MS is contributing code to the Jquery project.
来源：https://stackoverflow.com/questions/2805536/jquery-vs-mootools-which-is-having-good-performance-why