I took a look at the initial 4 year option grants for the first 10 engineers (this doesn't count refreshers or other follow on grants). The average value at $50/share (yesterday's opening price) is just over $10M. The group varied in experience from just out of school to a few years working when they joined. I feel we were a good deal more generous than the median company: https://amplitude.com/blog/employee-equity-is-broken-heres-o...
Someone on the FAANG side can figure out what the apples to apples comparison is. There's no question that in 90% of cases FAANG compensation is way better. If you are optimizing for how to make the most money over a few years you should absolutely choose FAANG. The real benefit of startups comes from other forms. If you asked that group of 10 I think they'd respond that being an early engineer at a start that IPOs gives you way more career capital and long term earning potential than FAANG.