With a moon base you have access to that water they mention, and perhaps enough sunlight to actually grow food (although the water seems to be in the wrong place for this). You have shelter by digging into the moon itself, and enough free raw materials to extract an atmosphere, make building materials, etc. You don't have to bring everything from earth. You have gravity as well, which makes for more comfortable living and building. None of that is available in moon orbit.
Although an orbiting moon base makes for a quicker return to earth vicinity, the value of "quick" makes it a fairly meaningless advantage. There is no point in putting a base in moon orbit unless you intend to frequently visit the moon surface. At which time you encounter the assent problem, the same problem you have with a moon base.
The major problem of a moon base, or simply visiting the moon, is the problem of fuel expenditures for lift off. For all the Buck Rogers si-fi we've written, we still can't carry enough fuel to get out of sight. Any system we have for getting off of the surface amounts to a zero-backup, Hail Mary. There is no plan B.
We (barely) got out of the moon program without the horror of stranding people there. Until a more realistic system for getting off the moon is built, putting a base there is just a disaster waiting to happen with our current technology.
Maybe it would be easier to build the often talked about space elevator on the moon.
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