Personally think the physical button control is better.
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The advantage of touch screen control is that what you see is what you get, but when touching, people's sight will briefly leave the road ahead, if the speed is fast enough, it is not a small safety hazard. However, the electronic touch screen can achieve more functions and the interactive experience is better.
Physical keys, as long as the operation is skilled, do not need to think about which key can achieve which function, you can rely on subconscious key control. The eyes will always stay focused, so it will be safer to compare on the basis of being familiar with the center control screen.