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The RS6 Avant is a special car with an identity; I'd totally get it.
The X5M is a souped up X5. A very nice and capable souped up X5, but nevertheless...that's what it is.
Interior is subjective; I happen to like Audis, especially with a separate screen that is more dedicated to touch/control.
Reliability between the two is identical.
With these two cars, it's an emotional purchase. It doesn't sound like you are running math to determine what's more prudent, so get the car that's calling your heart!
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