Sencha Touch feels a lot further along in development. They've been "feature complete" for a while, and most of their focus is on performance. I think the tra

Sencha Touch feels a lot further along in development. They've been "feature complete" for a while, and most of their focus is on performance. I think the tradeoff is in the learning curve. jQuery Mobile is probably easier for most developers to pick up and get going right away. Sencha Touch could take a bit more work for you to get up to speed with (but they're doing a better job of documenting their API). To answer your question: I think within a year jQuery Mobile will be lucky to get to where Sencha Touch is now. That should give the Sencha Touch team plenty of room to improve and be a significant improvement over jQuery Mobile for most projects. To me, the biggest downside to jQuery Mobile is the problems with the fixed navigation. They're relying on the browsers to render that, and it's not where it needs to be (even iOS 5, which finally supports fixed headers/footers is a bit off). Other than doing a full javascript re-write of that, they're only hope is that browser makers fix it, and people upgrade. It could take a while for that to happen, if it ever does. I wouldn't wait around for it.