I think that plastic statues (if someone can tell the difference if they are at a distance) scream, “I am not a wealthy parishioner.”
Resin is thrifty, and most Americans like me can’t tell the difference unless we tap on the scupture, or if there is a big obvious seam, or a UPC code and “Made in China” stamp. Resin is durable, too, although I’ve broken plenty of small resin pieces when dropping them. But hopefully no one will tip over a large work of resin art.
Also, no one has brought up the point yet that resin is easy to clean.
I think in the United States, “art” is looked upon with a little suspicion, especially if it is in a church. People wonder why money was spent on art instead of on helping the poor. Yes, I know what the Bible says about this. But the Bible doesn’t say to run out and buy an expensive piece of art instead of helping the poor. It just says to honor the Lord Jesus and worship Him. We don’t need a marble statue to do that.
I know that the Vatican is full of beautiful pieces of art. But our parishes are not the Vatican, and people don’t come to our parishes from all over the world.
Don’t go with plaster. I’ve seen some extremely ugly plaster statues. If they are not maintained, the paint flakes off–eugh. And if they get wet, even just a little, they “drip.” I would say to stay away from plaster.
Marble is indeed beautiful, but it’s so expensive and SO heavy! I would worry about the floor collapsing, unless it’s outside.
Wood is pretty, but again, expensive. Same for metal.
I say “simple is fine.”