Date registered: Sep 2007
Vehicle: 99 Merc S420 (80k Mi) 07 Lexus LS460 (21k Miles)
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You need to drive both and look at the ratings and reviews. The S550 is a better car. I have yet to see a segment review that ranks the A8L in the top 3. It's normally 1st S550, 745Li, LS460L, A8L OR 1st S550, LS460L, 745Li, A8L or something like that. I have never seen A8L take 1st prize. The build quality is top notch, but the reliabily isn't great. 07 S550 reliabilty seems to be middle of the road. Its not great and its not anywhere near as bad as 01 S430.