I used Phonegap but I kinda didn´t like it because of some error.
I then switched to Intel XDK that solved that error, but as you mentioned it will be shut down.
In the end I took a day to work into Cordova CLI and I´m done with build services (unless the C3 ones are good, since it would be a first-party build service)
The main problem I see with build services is the fact that they end up using Cordova anyway, but add another instance (their whole service and programs) that can cause errors, not to mention you either have to work around them or are at their mercy to fix them. In my case Intel said they cannot fix it because it would cause a security issue on their end and they just didn´t want to.
I also heard good things about Cocoon, but right now I don´t see a reason to switch.