Ok ups for plastics well they never grow so no pruning dont need a co2 system or specific lighting easy to clean move around and fish dont eat them
Now the downs sometimes they are sharp and can injure fish they dont take anything out of the water and they tend to collect alot of algea.
Down side to live plants require good substrate some co2 and descent lighting and hob filters lets out alot of the co2 in the water so canister filter is recommended carbon doesnt help plants at all so its best to not have a carbon filter, pruning so everything looks nice, live plants can die/ or melt if they melt they come back.
Up sides some fish snack on live plants so the fish are happier, life plant have infusoria probably mispelled that but they are food for small fry, provide extra o2 in the water help lower amonia nitrites and nitrates to make water changes less frequint it allows a little ability to over stock but dont go over board with that one. Plastic plants never change but live plants change almost daily and if they really like you they'll flower or pearl