Offer Accepted but Current Employer counters

Hello,

I'm stuck in a quandary.

I'm a senior fullstack dev with 10 yoe. I've been at my current job for about 4 months. The work-life balance was terrible at the start. I was talking to my friend about it, and he referred me to the company where he works. I would have been talking about a $10k pay cut for the original role, but during the interview, another candidate accepted an offer for the role I was applying for. The company liked me so much that they opened a senior role that matched my current pay. Now, after I already signed the offer, my original company countered with a $20k bump and 10% more equity.

Breakdown:

Both are startups

New Company

  • Better work-life balance
  • 100% In office
  • Same pay as the previous role
  • Referred by my irl friend.
  • An industry I've never worked in

Current Company

  • Better pay (20k bump to keep me + 10% increase to my equity). I speculate that the equity has more upside here.
  • More upside in equity
  • Remote - Work from home or anywhere in the world really
  • Flexibility - I can do stuff in the middle of the day. Requirements are that I need to get the work done, but it often bleeds into nights and weekends. This is important because my father is suffering from Alzheimer's, and we're about to move him to a memory care facility.
  • An industry I enjoy

What would you do? Would backing out on the offer now screw over my friend?