Today, Flink is the fastest Streaming solution. It is the core of an Azure and Google streaming offering today.
Yes, it depends on your use case. So if you can accept a little delay, go for Kafka or Spark because it is easier to find a team that knows Kafka.
When considering a BI tool, everyone looks for the leaders: Power-BI, QlikView and Tableau.
They all offer ease of use. However, consider Power-BI, QlikView for the technical team and Tableau for more business-oriented users.
Note, Power-BI is more compatible with MSFT365…