Answer: Podocarpus gracilior grows at a moderate rate, reaching 50 ft., 25 ft. wide; P. macrophylus is a slow grower, 15 to 20 feet tall, 6 to 8 feet wide. Of the two, I'd choose gracilior, both because of the growth rate and the fact that it flowers. If you choose gracilior, you can space them further apart to create a screening hedge.
Best wishes with your new plants!
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