The moon is great because it's so close a neighbor, and we can learn things about our planet's evolution by studying the moon.
Mars is great because it's a fairly hospitable planet all things considered, and was once a wet planet that may have harbored some simple form of life.
Yeah, it'd be cool if we could hit Mars, but a return to the moon would be incredible.
I'd like to do both.
The moon is great because it's so close a neighbor, and we can learn things about our planet's evolution by studying the moon.
Mars is great because it's a fairly hospitable planet all things considered, and was once a wet planet that may have harbored some simple form of life.