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It really depends on your needs here are some of the strengths of each:
- BBUi.js - Cross platform BB ie: it supports platforms from BB OS 6 to BB10 including Playbook. You can check out more information about it here: https://github.com/blackberry/bbUI.js.
- JQuery Mobile BB10 Theme - Gives you plenty of control but is really tailored more to BB10. It works well if you wish to use Jquery in your application. Here is the main repo for more information: https://github.com/blackberry/jQueryMobile-BB10-Theme checkout the kitchen sink for some great examples.
- Bootstrap is a great framework, but it does not include BB10 specific assets ie: you will have to implement the peek and action bar yourself if this is the look you wish.
