for example, Zeppelin has pluggable architecture so it does support not only scala but also python with built in Spark integration. Zeppelin not only support data exchange between scala and python environment but also SparkContext sharing for spark cluster resource utilization. It's got ability create rich interactive analytics GUI inside of notebook. It's got customizable layout system, and so on..

But I wanted to address more fundamental difference. Most competitors are opensource project. And as a opensource project, how community works and project direction are the most important things. That'll make huge difference in the end. And i think i explained and compared them.