Echoed from other places - but doing YC shouldn't be about the money or percentage ownership.
Yes, one day you'll look at the cap table and say, "man it would be great to have that x% to give to employees" - but very likely you're company will be in a dramatically different place progress-wise and valuation-wise, so it's a major net-gain.
Companies come into YC with nothing but wireframes and companies come in with six digit revenues. Both will exit dramatically further along, hyper-focused, and with higher valuations (in my experience). Companies that are unicorns or growing like crazy or have crazy utility get even higher valuations, and it all works out pretty well.
IMO standard deal makes things incredible simple and easy on the front end, without the massive majority of potential pitfalls (signaling, jealousy, negotiating time, etc)