Every ranking of these devices is written for streamers, which is why they are chronically undersold to everyone else. A stream deck is a set of physical buttons with a small screen behind each one, and the most valuable thing it does in a home office has nothing to do with streaming: it gives you a mute button that is always in the same place, always lit, and tells you at a glance whether your microphone is live. Anyone who has talked for thirty seconds while muted understands the value immediately.
Start with the key count, and start lower than you think. Fifteen keys covers mute, camera toggle, joining a call, switching between four or five applications, a handful of text snippets and your lighting - with room spare. Thirty-two keys is not twice as useful; it is mostly empty keys taking up desk depth. The genuine reason to spend more is dials rather than keys: a physical dial for call volume or microphone gain is a better interface than any on-screen slider, and it is the one thing a keyboard shortcut cannot replicate.
The second thing to weigh is software, and it is most of what you are paying for. Elgato's advantage over the cheaper alternatives is not the hardware - the key panels are broadly similar - it is a mature plugin ecosystem plus Smart Profiles, which swap the entire key layout automatically when you change application. That means one physical button can be mute in your meeting app and something else entirely in your editor. Cheaper units generally offer static layouts, and a static layout is a much smaller idea.
The honest caveat: if you already touch-type your shortcuts fluently, this is a convenience purchase rather than a productivity one. The people it genuinely changes things for are those who use tools with shortcuts they can never remember, and anyone who spends a large part of the day in meetings.
We research these from manufacturer specifications, published software documentation and owner feedback. We do not run timed productivity studies, and any claim that a macro pad saves a specific number of hours should be treated with suspicion - including from us.