Counter space is limited, so anything left out permanently needs to justify its spot with regular use.
Tools that handle a task you already do often, like reheating or frothing, tend to be worth the space more than single-use novelty items.
Easy cleanup is underrated. A tool that is a hassle to wash quietly stops getting used, no matter how well it works.
When in doubt, choose the simpler version of a tool. It is usually the one that lasts.