A single-serve brewer solves a particular problem: making the amount you intend to drink now. It can reduce leftover brewed coffee, but that benefit does not automatically make every single-cup system economical or low in packaging. The choice of consumable matters as much as the machine.
Capsule and pod systems offer premeasured portions and a relatively tidy workflow. Check the exact format a brewer accepts, local availability and disposal options. A machine with interchangeable drawers may also accept loose grounds; confirm this in its manual rather than assuming that similarly shaped capsules are interchangeable.
A dedicated machine is only one route to a single serving. A small French press, pour-over cone, moka pot or AeroPress can suit the same quantity with a different balance of preparation and cleaning. Compare your normal mug size, whether you want to choose fresh beans, and how much daily washing you will tolerate. Those decisions are more useful than an undifferentiated list of machine brands.
The conversation
A good question can make a better brew.