Power, modes, and controls
Compare replaceable batteries, USB charging, and the controls included with each design.
Compare how you change settings
A base dial, push button, wired controller, and wireless remote are different ways to operate a motor. Check the product photos and exact listing for the controls you will actually use. A USB rechargeable device can still have a separate battery-powered remote.
Read the mode count carefully
A listing might count patterns and intensity levels separately. If the design has two motors, check whether each has its own controls. A higher advertised count cannot tell you how the settings feel or how easy the interface is to operate.
Find other remote options
If wireless control is your main priority, compare handheld and app-controlled vibrators before deciding.