There are a lot of Scala/Spark kernels for IPython/Jupyter:
Does anybody know wich of them is most compatible with IPython/Jupyter and most comfortable to use with:
I can't speak for all of them, but I use Spark Kernel and it works very well for using both Scala and Spark.
I found IScala and Jupyter Scala less stable and less polished. Jupyter Scala always prints every variable value after I execute a cell; I don't want to see this 99% of the time.
Spark Kernel is my favourite. Both for Spark and plain old Scala.