5.5 NA V8 or 4.7 biturbo?

Good afternoon all…..I am looking around at S550's in the 2009 to 2013 range. I am noticing the two engine options that make up my thread title. Is one of these more problematic than the other? If so, in what ways? Thanks so much for your time.

Good afternoon all…..I am looking around at S550's in the 2009 to 2013 range. I am noticing the two engine options that make up my thread title. Is one of these more problematic than the other?
If so, in what ways? Thanks so much for your time.

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