No one here can answer this for you as it’s a function of personal preferences and your own financial situation.
PS is essentially domestic F, but a little better. It’s a significantly better seat and improved food. Would you pay $600 for this?
FWIW, I have a couple of TATL’s coming up and I paid for PS on the overnight in hopes of some sleep but not on the way home. I decided that I could either fly D1 on one trip or have two trips flying mixed cabin instead.