Sencha Touch is an enterprise grade product for building cross platform end to end mobile web apps with HTML5 and JavaScript. You can call it as the big daddy of mobile application development platforms in the commercial space, mostly enterprises. Sencha has a wide range of products that work hand to hand with Sencha Touch, most of these products carry heavy price tag.
For individual developers and freelances, ionic would make a better choice but for Enterprises, Sencha Touch easily leads the way.
ExtJS, one of the most popular JavaScript frameworks is at the core of Sencha touch platform which helps create high performance apps with near native experience. Sencha Touch packs ready to use widgets with native look and feel for all leading platforms including iOS, android, Windows Phone and Blackberry. Sencha also features a drag and drop HTML5 visual application builder with tons of ready to use templates. Custom components can also be built and added to the library for reuse across apps.