Congrats on your offer! Personally, I would chose the Firmware one because it will add a new skill set to your resume. The high-level software job sounds like j

Congrats on your offer! Personally, I would chose the Firmware one because it will add a new skill set to your resume. The high-level software job sounds like just another job (in the context of your resume). The difference in pay is an important matter which only you can decide.