This won't be an answer for you, but there is a helpful tool to help in debating the question - The Founder Pie Calculator: https://www.andrew.cmu.edu/user/fd0

This won't be an answer for you, but there is a helpful tool to help in debating the question - The Founder Pie Calculator: https://www.andrew.cmu.edu/user/fd0n/35%20Founders'%20Pie%20Calculator.htm https://www.andrew.cmu.edu/user/fd0n/35%20Founders'%20Pie%20... In particular you can fill it out yourself and ask your partner to fill it out, then compare notes. This will give you a subject to discuss and see if you can align your expectations. If you come to an agreement +/- some margin then you have your answer, if you don't it's something you want to know sooner rather than later.