You probably mean "better off" which means "in a better or more prosperous condition".
E.g. I would be better off with a new car.
She was better off in her old job.
There are a couple of other phrases:
"think better of"="to change one's mind about something".
E.g. She almost bought an expensive dress, but then she thought better of it. (She didn't buy it after all)
or "get the better of"="win a victory over".
E.g. He turned away from her before his anger got the better of him.