I guess it depends on your team. If you want to give a slight ATK & DEF buff to certain Magic girls on your team, the first one seems better. If you want to give a better ATK buff to herself (and if you habe good defense units in your team), the second one seems better.
Both of them looks good actually. I don't think it will make a major difference. First one may be a bit more interesting since it has a better ATK stat.