I've tried both. I'm disappointed with Cocoon.IO since it doesn't support many plugins + It has many unused permissions that makes our apps suspicious & bloatware.
I'd go with IntelXDK if I were you. Developers there are experts in compiling HTML5 apps. All cordova plugins are compatible there + no noticeable bloatware.
Yeah as — said, the only downside is the apk file size.
BTW IntelXDK is way faster now compared back then when Cocoon.IO was said to be faster.