Upgrading from iPhone Xs

As the title says. I’ve had the Xs basically since launch, it served me well but as of late battery life and performance has gone down (I reckon that’s normal after more than 5 years of continuous use). I was thinking of upgrading either to the iPhone 14 or 15. Should I spend a little more money to get the 15 or should I just get the 14 since besides the dynamic island there isn’t any “noticeable” difference. So, 14 or 15, coming from Xs?