Judgement A. Some historians have described Mary Queen of Scots as a tragic heroine who did not deserve to be executed. There is plenty of evidence to support this view. For example:

The evidence is strengthened by the fact that some of the sources agree with each other. For example:

However, not all of the evidence is equally reliable. For example:

Judgement B. Other historians have described her as a foolish, treacherous woman who deserved to be executed. There is also evidence to support this view. For example:

The evidence is strengthened by the fact that some of the sources agree with each other. For example:

However, not all of the evidence is equally reliable. For example:

Having considered all the evidence, I agree with:
Judgement A/B (delete as applicable)

First of all, the Judgement I have chosen fits in with what I already know about Mary Queen of Scots. For example:

My second reason is that there is more agreement among the sources supporting my chosen Judgement. For example:

Finally, the evidence supporting my choice of Judgement seems, on the whole, to be more convincing than the evidence supporting the opposing Judgement. For example:

However, there are points in the evidence to support the opposing Judgement that I also agree with. For example:

If I could replace Judgements A and B with one overall judgement, it would be this: