Thanks for the response. I don't feel I would deserve an equal share as they are also willing to use the resources of their company (staff) for selling the prod

Thanks for the response. I don't feel I would deserve an equal share as they are also willing to use the resources of their company (staff) for selling the product. Researching more on HN, I feel 25% is reasonable vesting over 4 years. That would mean after 4 years, their contributing would be 50% more than mine (37.5% each). I believe they can help bring sales which would make that reasonable.