Hi Ryan,
I have tried the BA10/BA12 combination and now use the BA10/MG12TV combination, both with the MG350 and MG800 heads.
The BA10/BA12 combination works very well as others have mentioned. The two cabinets compliment each other nicely with no holes or overly pronounced frequencies. This stack really shines on bigger stages where you can get away from the cabs and move around the stage...the sound is big and balanced with excellent dispersion.
I chose to use the BA10/MG12TV for a couple of reasons. Almost all of my gigs are on small, tight stages and the smaller footprint of the MG12TV is advantageous in those situations. While the BA12 isn't difficult to carry at all, lighter weight has become important to me and the MG12TV is about 10 pounds lighter and more compact than the BA12. The MG12TV is also taller so the BA10 gets a little closer to my ears.
In the overall band mix the BA12 will be a bit deeper and smoother than the MG12TV but not by much. So overall it just depends on your individual needs. I would give a slight nod to the BA12 for overall sound, but I don't give up much with the MG12TV and the ergonomics suit my needs much better.
I took a couple of pics of my rig at our last gig during setup. I really like this combination.
I use a BabyGramma between the two cabinets for stability and it works well.
Let me know if you have any other questions, and good luck in your decision.
Bob
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