Hello Allyson, I totally agree with Caoimhe. You also have to think about it in the long term, and what you want in the future with your horse. If you want to show, buying a green horse can be great but you can't be sure that it will be fine for him to show. With a trained horse, you already have a great idea of what he can do
It depends entirely on your skill level, your free time, and what you want from the horse.