New to Fold game and have some questions around which phone

Greetings! I am looking to make a jump from iOS to Android for the first time in well over a decade. I am torn between (paying cash) the Z Fold 4, Z Fold 5, OnePlus Open, and Pixel Fold. Is there a notable difference between the 4 and 5, and are there any advantages to either the OPO or Pixel Fold? I'm leaning towards Samsung since that was my brand before I left Android years ago so posting here for insight.