It depends what you're looking for. The CTS-V is a cool car as well but to me, the quality is just not there. I was in the same boat as you but for my winter car. I bought a Jeep, sold it and got an X5.
It's just not the same feeling. American cars feel cheaper, look cheaper and TBH, the chassis of the M3 is so much better than the Cadi.
If you don't care about all that, get the Cadi, it will go fast for sure
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