I got down to exactly the same decision when I bought. CGM or IBM.
I drove both and sat them side by side in the sunlight. The deep metallic colors of the CGM won me over. Pictures cannot capture it.
However, there isnt a wrong choice here. It is simply a matter of personal taste.
The IBM is also very very beautiful.
2013 ZL1, Victory Red, Auto, Sunroof
Microfiber Suede Interior, Premium Mats, Cargo Mat
Illuminated Footwell and Cupholders
Chevy MyLink Touchscreen System