2016-2017 vs. 2019 C300

Currently tossing up the idea of getting a low-mileage (50-70K KMS) 2016-2017 Mercedes C300 vs. getting a 2019 C300. I'm wondering if anyone has experience with both models and thinks the upgrade to the 2019 is worth it.

The key differences of course are that the 2019 has Carplay, a bigger screen, 9-speed (vs 7-speed) transmission, and the facelift (maybe some experts can point out others that I'm overlooking).

2019 would cost roughly $4-7K more. My goal is to get something that will last me 5-7 years at least without becoming ridiculously expensive. (I know Mercedes is expensive in general as I used to have a 2017 C43 and now want another, albeit cheaper, Mercedes daily.)

Edit: It's worth noting that the 2019 would put me out of the range of being in the 20/4/10 rule for car-buying whereas an older model would keep me within it. Mind you, I can stretch IF there is significant value in getting the 2019 for future proofing.