I can only talk on what I know so here goes.
The AR500 Steel plates are heavy, but they take multiple hits extremely well even if the hits are placed close together. They are good against most commonly used pistol and rifle rounds up to 30-06. AP ammo does a lot more damage, but sof armor backings would mitigate that. Hot loads of 5.56 (55 grains or less) would easily pass through the AR500 Steel, so again would recommend soft armor backings. The price is a lot more managable (you can get a front and rear plate for less than $200). One negative it the potential of fragmentation upon impact.
Ceramic plates take hits extremely well, just not multiple hits in the same area. My issue with Ceramic plates is they are a lot easier to damage during normal use (do not drop them on the edge or corners... trust me) which sucks because they are a lot more expensive. Good thing, extremely low risk of any fragmentation. I really don't have much experience with the other two though. Sorry I couldn't be more of a help.
I run AR500 steel plates in my carrier due to it's ability to take a good hit and not deliver a huge hit to my Visa card.
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