Honest, any of the three will do you and unless you’re capable of shaving milliseconds off a lap time through pressure balancing, you’ll prob be hard pressed to notice the difference between the two Michelins. The PS4S has a slightly stiffer side wall, but again we’re talking fractions.
I’ve tried the 4S and they’re good, but chose to run the 5 on my car. As you say, the extra wear is massively worth the difference over pretty much any other tyre, when it comes to your pocket. So yeah, PS5 would be my shout.
It’s also a pretty tyre which we all know is the most important thing when it comes to choosing rubber, eh gang? 😉🤣