If you already experienced Michelin and like them, I would stick with them.
They make great tires.
Also, you should define what the word pleasure means to you.
One man’s pleasure can be another’s boring.
Or one’s pleasure can be another’s scary, or a bit out of my comfort zone.
If one is happy coasting or maintaining safe/posted speed around corners, less tire is required.
If one likes to carry speed in corners or see if you can gap the car behind you by corner exit, then more tire is required.
All the tires mentioned above are good choices for Mustangs.
The general differences can be summarized like this:
PS4S, more performance oriented than the AS4. So stiffer sidewall for cornering grip. Downside is harsher or less comfortable ride than AS4.
PS4S has softer rubber than AS4 for better grip, but wears faster. Don’t get as much mileage out of them.
PS4S cost more than AS4 and don’t last as long. Budget implications.
Generally the AS4 should be better in wet conditions than PS4S.
PS5S should fall in between the other two.
Less performance than PS4S but more than AS4.
Less grip than PS4S but more than AS4.
More confort than PS4S but less than AS4.
Will last a bit longer than PS4S but not as long ad AS4.
So a few factors can guide decision.
Ride comfort and longevity vs level of grip and cornering ability desired.
Budget.
Maybe wet performance for some.
The definition of pleasure at the outset can guide wether ride comfort or grip is the more important feature.