It's not worse, it's not better. There are a few variables about how low and how high batteries are (de-)charged each time. But when using a good charger that is rarely something to worry about. Most important is the cycle count. How often charge/discharge. And hence, whether you spread the cycles over two and then add one, or over three to begin with doesn't matter. I have numbered the three that I have and make sure I rotate them evenly.