I own both a 2016.5 Model S 75 and a 2019 LR RWD Model 3. I purchased the Model S used from Tesla last year and I am relieved it came with a manufacturer’s limited warranty since we have already experienced a bunch of issues that had to be fixed. Looking ahead and based on what I’ve read here, there is a good chance that door handles and LED light strips will fail. Moreover, while Tesla now covers replacement of the Tegra daughterboard if it starts failing, it can take a while for them to agree to the repair or even to have the replacement parts available according to some folks here (in my case, they replaced it right away without any back and forth). Note though that even with the new daughter board, MCU 1 feels frustratingly sluggish compared to the MCU in the Model 3 (but perhaps my impression is clouded by the fact that I can compare both cars side by side).
In terms of noise level, road noise in the Model S seems quieter (not by a great deal) on some roads but the wind noise seems slightly louder than in the Model 3. Due to the larger wheelbase and softer springs/air suspension (depending on the setup), the Model S rides smoother compared to the sportier Model 3. I personally prefer driving the Model 3 when I am by myself (and can drive more aggressively) and the Model S when my family is in the car (since my kids tend to get car sick in the Model 3 with my more spirited driving). The hatch and larger cargo space in the Model S is important to us as we can easily take our dog when we travel. Unfortunately, range is worse for the Model S (249 rated vs 325 rated for the Model 3) and it’s charging rate is slower which means it’s less ideal for longer trips (300 miles+).
I think in the end it comes down to what’s more important to you, updated technology, sportier driving, and 4 year warranty or more comfortable suspension, larger cabin and cargo space, and a more luxurious overall feel (although admittedly it’s getting a bit long in the tooth). If you end up buying the Model S, I highly recommend spending $1,500 + tax to upgrade the MCU to save you a lot of frustration.