Closure Library vs Zepto

zepto - Core module; contains most methods;event - Event handling via on() & off();ajax - XMLHttpRequest and JSONP functionality;form - Serialize & submit web forms;ie - Add support for Internet Explorer 10+ on desktop and Windows Phone 8.;detect - Provides $.os and $.browser information;fx - The animate() method;fx_methods - Animated show, hide, toggle, and fade*() methods.;assets - Experimental support for cleaning up iOS memory after removing image elements from the DOM.;data - A full-blown data() method, capable of storing arbitrary objects in memory.;deferred - Provides $.Deferred promises API. Depends on the "callbacks" module. ;When included, $.ajax() supports a promise interface for chaining callbacks.;callbacks - Provides $.Callbacks for use in "deferred" module.;selector - Experimental jQuery CSS extensions support for functionality such as $('div:first') and el.is(':visible').;touch - Fires tap and swipe–related events on touch devices. This works with both `touch` (iOS, Android) and `pointer` events (Windows Phone).;gesture - Fires pinch gesture events on touch devices;stack - Provides andSelf & end() chaining methods;ios3 - String.prototype.trim and Array.prototype.reduce methods (if they are missing) for compatibility with iOS 3.x.

cross-browser functions for DOM manipulations and events, Ajax and JSON; high-level objects such as User Interface widgets and Controls