Honestly, and this may sound like I am contradicting myself a bit, but I guess what I am talking about is not quite the same thing as Dojo Widgets etc. Its along the same lines, but if you are trying to choose between for example building on top of Dojo Wigets or Sencha and using something like Meteor, I would lean towards Meteor unless the UI you are building looks like a traditional desktop application and has a lot of classic desktopy widgets in it that you can map to the existing Dojo (or whatever) widgets.
If the choice is between Meteor and my system, I would choose my system, of course (although I may be biased and honestly my system has a month or two of work left before its really ready for release). Whereas Dojo Widgets (for example) are only for the front end and designed to look like a desktop application, my components include both front end and back end code, with automatic database wiring, and the widgets are set up so that it is easy to customize their appearance.
If the choice is between Meteor and my system, I would choose my system, of course (although I may be biased and honestly my system has a month or two of work left before its really ready for release). Whereas Dojo Widgets (for example) are only for the front end and designed to look like a desktop application, my components include both front end and back end code, with automatic database wiring, and the widgets are set up so that it is easy to customize their appearance.