I've tried to use both Paw and Postman. Always ended up going back to HTTPie (https://github.com/jakubroztocil/httpie). It's much faster than clicking through a GUI, at least for basic requests (which is what 95% of requests are).
Don't get me wrong, Paw is a really nice app, but I don't feel that it rivals the productivity of bash-jitsu for most day-to-day use.