What are you trying to heat/ cook? That would be a better question to find an answer to. The pocket rocket is good, small, and comes with maintenance tools, but is not great for cooking foods except warming/ boiling water or soups. You can cook with it, but its a little more difficult then Jetboil.

Jetboil depends on which version you get, that would be the second question to answer, which model are you trying to compare to the MSR pocket-rocket.