Thanks for the replies folks!. I did test drive them back to back and all said, I liked the 535 better. Compared to the 528, the 535 had a smoother driving experience.
I generally tend to use the car for 7 - 8 years and have *low* mileage. (My 6 y0 X3 has 8K miles!). From that perspective which of the cars is likely to hold the value better?
The dealer did give me another option to consider: A 535 w/o sport and no drivers assistance package but has luxury seating package. Wondering how useful the drivers assistance package is. I have never had a car of this size before (my X3 and Subaru outback are much smaller). Ergo, thought the front view & top view cameras will be helpful.