In case anyone missed it, one of the original creators of SparkR has just proposed deprecating SparkR in favor of sparklyr. Although I know R and have had some experience with it, I cannot say for sure about the advantages of SparkR over sparklyr. But what I can see is that SparkR is suffering from a lack of maintenance and maybe it is really better for the Apache Spark community to drop the R bindings...
https://lists.apache.org/thread/qjgsgxklvpvyvbzsx1qr8o533j4zjlm5