You get to say you were lead developer and employee #1 of a startup that sold for x when doing your own startup (this can actually be useful!) You can also now

You get to say you were lead developer and employee #1 of a startup that sold for x when doing your own startup (this can actually be useful!) You can also now negotiate market level salary or a loyalty bonus to stay and ensure smooth takeover/handover. You are likely to get more this route than via your equity if you have 1%.