I went from F86 X6 M to a 2020 E63 S (pre-facelift) and I have been very happy so far.
My service experience with Mercedes has been on a whole new level compared to BMW, but that's very dealer specific. Unfortunately, the dealers in South Florida are a mixed bag. As you stated, BMW includes the service, with Mercedes you pay per service or you can elect to prepay for your maintenance which results in a lower price.
As far as discounts go, I think it's harder to get discounts on an AMG. Leasing rates for AMG's are generally also worse than M. I have no experience with MBUX, but I can tell you the infotainment in the pre-facelift is not great. The screens look amazing, but the system is very slow to respond. But that should all be resolved with MBUX.
I think you will be happy with either choice, both are amazing cars.
Last edited by foldpages; 08-26-2020 at 12:48 PM..
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