Lexus photo looks German in ancestry. Buick looks American, but then again I am unfamiliar with the Chinese aesthetic, so it could very well be Chinese-American. After all, we are a nation of immigrants...
The Lexus screen looks like an afterthought, stuck up there in its own cubby, but M-B and BMW both do the same thing, so it might be accepted by customers, although imo a pop-up screen without the cubby would clean that dash up nicely. The Lexus buttons are segregated, which is a good thing for ease of use, the Buick's buttons are all in a mass array, seems like it'd be harder to master, based on photos only.
They're both nice in the photos, but if the Lexus had an unobtrusive pop-up nav screen (which would not ever be popped up by me), I'd have to go with the Lexus, based on the supplied photographic evidence. A big "if".
EDIT: I was not prepared to say this, but I like the looks of this car, after checking the gallery. It was transformed from a granny car to something a young male executive might drive. It is sporty and clean, looks low and long in the photos. Best use of the new corporate facial expression, too, not overwrought like in some other models. Like a modern missile, kind of phallic, and what guy doesn't appreciate that?
As far as the dash-to-door trim situation, it doesn't flow together, but it's still fine. Having those two areas meet perfectly is a difficult task... if it is off, the customer is disappointed and annoyed because they have to look at it all the time. This way, the dash is the dash and the door is the door, I see no problemo there.
And while I might equate switch blanks with foreign car cheapness, I have to remember the Japanese manufacturers have been doing this for decades, and their customers apparently do not care, or they would have stopped doing it long ago.