battery options

I have an H501s. The transmitter takes 4 AA batteries or one can use other batteries with a compatible connector. I have 2 such batteries: one is a 1300mAh 7.4v 2C 9.62Wh and a 1400mAh 7.4v 1C 10.36Wh. Other than the ability to recharge, what are the pros and cons of AA versus the other 2...