I was/am a big fan of Ejecta as it really easy to build on iOS. You have complete control of the build, you can use True Type fonts in apps.
Also the Xcode and the Simulator is great for testing, rather than the laborious build>download>transfer>test process with cloud builders.
However I recommend the Intel XDK as a close second in terms of workflow. The XDK builds run well on iOS 8 too, and there is broad plugin support, even though there are some annoying audio issues on iOS.
I still use Ejecta to get iPhone 6+ screenshots in the simulator. I've found no other good way to get them unless you have a physical 6+ device.