Juhani was more deep than Bastila, she had more of a backstory, she grew up in the slums, was enamoured by the Jedi, and strove to become one. Bastila on the other hand, was born into a pretty good, albeit dysfunctional family, was sent to the Jedi academy at a young age, and had a lust for power. Bleh.
Juhani on the other hand, came out of a genocide, escaped the slave trade through the help of Revan, and became a Jedi against all odds. Granted she was the token alien Jewish Holocaust survivor, but she was kewl.