Why should I use jQuery Mobile instead of some other framework?

Why should I use jQuery Mobile instead of some other framework?

I'm not a super-experienced developer but I've been now doing some mobile app development with jQuery Mobile. However, I have recently discovered the Ionic framework which looks very interesting, and now I'm wondering if I should switch to using that... 

Any opinions on this? Which one is "better" and why? Why should I stick with jQuery Mobile? Thanks for your views!