How should I structure an essay evaluating the view that Aquinas' 'Analogy' is more revealing than Wittgenstein's 'Language Games'?

Firstly, you need to 'get off the fence' and decide which you actually believe to be 'more revealing'. Although in Philosophy essays time is very tight, it is definitely worth taking a few minutes at the beginning to jot down pros & cons of each argument, particularly if the information for this topic does not flow particularly easily, or you don't yet have an opinion as to which is more successful. This will help your writing flow, rather than having to stop and think many times. To structure this essay, you could take a binary approach, focusing first on Aquinas's ideas and then on Wittgenstein's if this helps you order your thoughts, or you can find similarities and differences, then put them against each other in 3 or 4 paragraphs that weigh them up.Perhaps most importantly, do not forget your conclusion. If you are writing this essay under timed conditions, for assessment, then the worst thing you can do is to not draw some kind of conclusion at the end - this will always allow you to reach higher marks than writing another information filled paragraph as the question will always require you to make a judgement on the question. To help you do this you may wish to end each of your 3/4 paragraphs with a small conclusion at the end. For example: 'For this reason, that analogy must be translated into univocal language, it can be said that Language Games is more revealing as it is more accessible than Aquinas's Analogy.'