your suggestion for ImmiCanada

We plan to DIY Canada Immigration as back up but not sure who should be the primary applicant.Both of us have US master degree.

LG, Master of CHE, F1 during OPT. 3 years working experience in china + 3 years TA/RA in US
Myself Accouting , H1, 5 years working experience in china, and 2 years in US

is it more favorable becasue he has engineering degree? or I'm the primary applicant because i have US experience and totaly 7 years of experience.

Thanks for any suggestions.