How should I go about comparing different electoral systems in an essay?

Before you should put pen to paper, the first thing I would recommend doing is breaking down the features that your ideal electoral system would embody. In British politics, a good idea is to draw inspiration from the 1998 Jenkins Commission, which outlined four requirements for electoral systems. Establishing a set of criteria or features in any comparison essay is a great way to form the introduction and structure of your essay.
Regarding structure, in the case of electoral systems, there are two really strong ways to go about it. Foremost, you could write a paragraph for each of your features and assess the electoral systems against each other. Effectively your essay would be made up of 4-5 mini essays focused on how the systems fair up against each feature. In my opinion, this is a great way of showing high-level comparison skills and still keeping your essay focused on the issue at hand. Another way of structuring your essay is to do one paragraph per electoral system and how they break down against your criteria. This is often seen as a more simplistic way of approaching this question however it can be said that you will be able to go into more depth about the systems. Furthermore, it can be said that this way is easier to revise, with you being able to focus upon the electoral systems one at a time. Either way, with a good degree of examples and a confident display of reasoning, this can be a very useful question to master in revision!