For ease of use, try each for yourself. Different people may perceive the same interface as having different degrees of ease of use.
As far as data privacy goes, assume you'll have none with regard to features which collect information. Whether that data will exploited in some way which is detrimental to you seems exceedingly unlikely, but it all depends on your level of paranoia. Cars which communicate and update wirelessly can be assumed to be sending their data somewhere, usually for a facially valid and necessary purpose. Data which is not transmitted wirelessly can still probably be accessed through a dealer's diagnostic computer, regardless of brand of vehicle.
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