I own a 2018 Model 3 and I love it. Plus it's in good shape with limited maintenance. I'm looking to trade it in. But honestly, I don't want to buy effectively the same car but slightly worse, with no turn signals (the recent M3) or an uglier version (the Model Y.) Historically, upgrading from an eight-year old car to the current version of the same model was a pretty big upgrade. Not with Tesla: I'll either keep this car until the wheels fall off, or I'll buy an R2.
The Y is hideous.
You should rent a latest 3/Y for 3 days and then make the decision.
The difference between them are subtle but massive. To the point, I will say a good amount of Tesla owners complains about build quality are fully on point.
On the other hand, those same people will be pleasantly surprised if they try out ~2025 models.
I own both. To an external eye, latest Y just has lightbar and more space. But only when you use it, you notice the QoL improvements. I rarely drive the M3 even though it is the more "fun" car...
As for turn signal stalk, it is present in Y. and newer 3 as far as I know.