It really is hit or miss. I would personally suggest to say away from 09's. While the CSC is a known issue, there are aftermarket solutions available.
The S4 isn't bad, but I wouldn't consider it to be in the same category as this vehicle. The Z06 is a monster but, as you mentioned, the interior isn't as refined.
The 335i is a great car (especially with the N54), but as you mentioned, the maintenance is FAR beyond what you would ever pay on the Z. The reliability on the block is great but the rest of the car is not.
If you're looking for a reliable ride, get a Z and expect to get the CSC fixed at some point. If you're into HPDE's, expect to put in a moderate amount of work to not have to deal with a decent amount of downtime between groups of laps.
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