Bootstrap is a bit too heavy for a mobile app. Meteoric has done wonders in getting ionic into meteor and there is actually a boilerplate https://github.com/dalequi/meteor-meteoric-boilerplate you can start off of. If you're willing to go the extra mile to provide a native-like performance, you can try famous but to bootstrap fast, meteoric seems to be the more reasonable choice.
https://i.reddit.com/r/Meteor/comments/2vj881/what_mobile_frontend_ui_framework_can_you/