It's been a while since I used the Aebersold but...

Several factors to consider:

- What instrument are you playing? If I remember, Aebersold has the piano on one channel and the other instruments on both. If you play piano, you can pan the piano out. If you play sax, guitar, etc, the tracks will back you beautifully.

- Aebersold tracks are fixed in tempo, length and key. BIAB can change these easily.

- You will have a learning curve to climb using BIAB. None with Aebersold.

- Aebersold tracks are recorded in real time in it's entirety. BIAB tracks are pieced together using a max of 8 bars. There are some complaints about how the resulting tracks sound phrase-wise.

- Does Aebersold have the songs you want?

Hope this helps.
R