I have experience with Grafana and JMeter.
Whenever a comparison is made between JMeter and BlazeMeter, there are a lot of differences one can observe. With JMeter, our company has to concentrate on the features as it is an open-source tool that works with Java. The configuration of the systems should have some high-end configuration, and the heap size depends upon the load our company uses. JMeter can be used in UI or GUI mode or in a non-GUI mode. If users have to go with a smoke test and the preparation of scripts, the GUI mode of JMeter can be used. For the actual execution of load testing, we have to go with JMeter's non-GUI mode. With the non-GUI mode, until the completion of the test, I could see the percentage of the error, but I couldn't see what kind of error was there in the application. In JMeter, I had to wait until the completion of the entire test. When we use the BlazeMeter cloud as a licensed tool in our company, we do have to deal with the setup of any configuration area. With BlazeMeter, whenever our company executes the load test, parallelly we can monitor what kind of errors we get, and if possible, we can have a word with the development team in parallel and we can solve all the issues so we don't need to wait until the completion of the tests as some of them may be longer than thirty minutes to an hour. In current situations, everything works in the cloud, and every request and every click gets counted in the cost. In BlazeMeter, there is no need to wait till completion of the one hour or until the end of the testing phase. BlazeMeter provides better reporting, but it takes much longer to do so, making it an area of concern where improvements are required. It is not always sufficient to only use BlazeMeter.