Toby was both a champion and an obedience title holder. They also tend to be much more emotionally dependent on their handlers, especially if they have women handlers. They consistently tend to pick up new behaviors faster. They also tend to try to out-think you. More than once, by the time I think that I have trained one of my girls a new exercise, she has already figured out three or four ways to get around doing it.
Females also tend to be more intuitive and aware of their handler's mood.
In my experiences, they tend to read my anxieties more accurately and it tends to affect their performances, often for the bad. Mother nature has a lot to say about how you dog will perform whether they are male or female. Bitches react differently at different times of the year due to their heat cycle. False pregnancies can change your bitches personality. This is also a concern for your future obedience prospect.