Choose the layout first
Check the exact regional layout, arrow cluster and function row. Think about work shortcuts as well as games before removing keys to gain mouse space.
Compare keyboards by layout, switch behaviour, connection and the games you play.
Start with the keys and shortcuts you use every day. A compact board can free desk space, but it may also move familiar controls onto a layer you would need to learn.
Check the exact regional layout, arrow cluster and function row. Think about work shortcuts as well as games before removing keys to gain mouse space.
Compare feel and sound when possible. For adjustable actuation or rapid-trigger functions, read which keys and modes the specific model supports and how the settings are stored.
Review wired and wireless modes, configuration requirements and whether your operating system supports the features you want. Include replacement keycaps or switches only when the board supports them.