it will never be better than fiber for the simple fact that’s it’s less reliable. The “uptime” of a fiber connection to the home will most likely be higher than a fiber-like connection from a satellite. And you’ll have better “ping”.
Fiber doesn’t care about cloudy days, typical storms, etc.
Starlink is of course superior when there’s a massive natural disaster, or major power loss to your region. Or if you’re in a rural area with zero other good options.