E.R. Campbell said:
Personal opinion, because I'm too long retired to know about Mil Law anymore: were I a member of a court I might be inclined to view the (main or alternative) "conduct to the prejudice" charges as being issues of human failure or human weakness that, while involving a breach of regulations by a senior officer who must have known better, are 'understandable' as human failings that require only a modest punishment - presuming the charges are proven.
Obstruction of justice appears, to me anyway, to be a more serious. Without having read the charge sheet I might feel that we are talking about a general officer lying to investigators, trying to cover up and so on. As a member of a court, I might consider that an issue that, assuming again that the charges are proven, warrants very serious punishment, indeed.