Saying which is best is tough. There are many options and everyone mine define what is best differently. For some its convenience - plug & play & others its cost out the door. I think we all want reliability and ease of use.
Once the air system is setup it's a pretty much plug & play. As I've never used it others can give feedback about your concerns. Before I ruled out the air braking I'd get advice as you did here, and talk to a dealership or two about things.
For my setup I went with the NSA ReadyBrake system
which I documented on this post