Spacer size, aesthetically speaking 25mm or 20mm in rear?

[jiigan]

I have a 2011 e70 35I with the sport package.

I am lowering the car with the 1.2" H&R springs. Which if my research is right should lower it about 1.5".

I am going back and forth between 15mm in the front and 25mm in the back or 12mm in the front and 20mm in the back spacers.
Any opinions? If anybody has picture directly from front and back with either of those combinations please post.

Thanks