e92 M3 - Squared vs. Staggered Setup?

I am looking into buying a dedicated set of track wheels and tires but am not sure whether to go with a staggered or square setup on my 2012 e92 M3. I have read about the pros and cons of each but it seems like a staggered setup with the widest possible wheels is the best setup for the e92 M3. I've read that the square setup is better for the e46 because it had significant understeer with a staggered setup; an issue that BMW addressed in the e92.

I have Fortune Auto Coilovers and am thinking of running 19x9.5 fronts and 19x10 rears. Wanted to find out if anyone has experience running either setup and what size wheels are you running.

Thanks.

-Vikas