Re: Which in the end will provide more data?
Presumably "more" isn't really the most useful metric; and something like "most interesting" or "most useful" would be preferable. Which is not to say that either remote or in-person is better, just that (as an extreme "straw man" example) terabytes of high resolution images and measurements of a single randomly chosen rock might give you the most data, but not really be what is wanted.