The 2.3 is not slow at all in the 190....not to mention easier to work on. It'd be a tough call between a 190e 2.6 and a 300E though, the 300E is bigger but the 190 is way sportier and almost as comfortable, just a bit *small* in the cockpit. Who cares about rear legroom, I'm not sitting back there! 
I work on both of them regularly and they're about the same, some things on the 190 are a bit more cramped.
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