Postman is for API verification. It can be used for inspections of API as well.   JMeter is mainly used for performance tests - such as a load or stress test. Both tools have different perspectives, however API calls can be intersected between them.

Performance Testing can be classified as Load, Stress , Endurance or Volume Testing , Breakpoints test or Scalability Test. Most important metrics are baseline and Key Performance Indicator ( KPI) matrix of the transactions.

HI Don, As of now Browserstack supports selenium for compatibility . As HP UFT have mobile center for mobile testing , didn't find any integration toward Browser Stack

I tried this application in one NYC Agency. This app works overall fine for Public facing web sites . Great support of devices.

HP Loadrunner has more support but MS TFS is easy to record and run , and don't need multiple modules