It definitely depends on how many people will concurrently be streaming/using the internet in your home, but I have 60 Mbps and it has been fine for me. Usually it's between 2-4 devices actively using the internet. One of them is a 4k stream. I haven't had any issues. I always want to make sure people understand what they are getting when they buy "faster" internet. Most websites on the internet won't deliver content faster than 100 Mbps. So it doesn't matter if you have gigabit, you will still only get 100 Mbps for a single stream. (Exceptions exist, but often only for large file downloads).

A good example is a freeway. Paying more for internet will raise the speed limit to a certain point, but no faster after ~100 Mbps. It does add more lanes so that more people in your home can use the internet quickly.