It depends what you mean by “better”. Do you mean a small but measurable difference in battery capacity in the lab after many years of use? Do you mean a practical difference in the car in the typical time a car is owned? Or do you mean how accurately the car reports battery capacity? Or do you mean being ready for an unexpected trip or power outage? If your priority is the first option, then charge to 70%. Otherwise charge to 90% and stop reading people who obsess about the battery, and just enjoy the car.