LBO case study: should i use "PF Ebitda" or "Ebitda"?

hi everyone, I am preparing for the case study using the IMs I find online.
Most of them highlight multiple and growth rate of PF Eibita instead of Ebitda. i am wondering if I should use PF Ebita to build my model and my valuation, or I should stick to Ebita?
If i need to use PF ebitda, how can i project the adjustments?
Can anyone explain why?
Thank you so much for your help!!!!