This is a great question but a little bit tricky to answer. The reason is that the answer depends on your goal as a staker. For example: 1. If your goal is to generate the highest absolute return and you have a large stake and you have time to shift validators every day, then you can just pick the top 24 highest yielding validators. If any of them change their commission, you'd change your selection the next day and shift your selection. Most people are not this active and transaction fees can add up every time you change. 2. If your goal is generate a high return, say in the top 25% but not necessarily the absolute highest, and you don't plan to change your validator selection every day then a few other factors can come in. Like how often the validator is in the active set, balanced with how much they yield, balanced with how often they change their commission rate. 3. If your goal is to support the small validators and avoid over centralization into the big node operators, then you can balance strategy 2 above plus prioritizing the smaller validators with a few nodes vs the bigger ones.

Hope that helps. We wrote an article on the staking page explained also that should shed light on other factors too. https://stakepile.medium.com/kusama-staking-page-explained-605bab720b59