The Stats

jQuery CoreMooTools Core
Library Size55.9K64.3K
Features
LicenseMIT & GPLMIT
DOM Utilitesyesyes
Animationyesyes
Event Handlingyesyes
CSS3 Selectorsyes (a subset)yes (a subset)
Ajaxyesyes
Native Extensions (excluding Element)about a dozen for Array, Object, and Stringabout six dozen for Array, Object, String, Function, and Number
InheritanceNot supported directly with jQueryProvided with Class constructor
Other Considerations
plug-insHundreds of unofficial plug-ins in a directory at plugins.jquery.comRoughly 4 dozen official plug-ins available at mootools.net/more. Unofficial plugin directory at mootools.net/plugins.
Official UI libraryyesno

Information based on data from jquery.commootools.net, and wikipedia.com.

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Karthikeyan KjqueryJquery,mootools
The StatsjQuery Core MooTools CoreLibrary Size 55.9K 64.3KFeaturesLicense MIT & GPL MITDOM Utilites yes yesAnimation yes yesEvent Handling yes yesCSS3 Selectors yes (a subset) yes (a subset)Ajax yes yesNative Extensions (excluding Element) about a dozen for Array, Object, and String about six dozen for Array, Object, String, Function, and NumberInheritance Not supported directly with jQuery Provided with Class constructorOther Considerationsplug-ins Hundreds of unofficial plug-ins in a directory at plugins.jquery.com Roughly 4 dozen official plug-ins available...