Just another thought here....the reason, in my opinion, that there isn't a "right" choice, that there is no consensus, is that the question really isn't one of statistics (at least not entirely--yes I know that adjusting for baseline will minimize variance etc). The answer really depends on what the question is. For example, if we want to know if one group ends with a better value than the other, that would be a different analysis than if the question is what treatment leads to greater change. You might imagine a clinical scenario in which getting below a threshold value (i.e. below a diastolic blood pressure of 90) is more important than how much of a decrease there is, and vice versa.
Best
Rich
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