The "best" VooPoo unit can vary depending on individual preferences and needs. VooPoo offers a diverse range of devices, each catering to different vaping styles. Some popular options include the VooPoo Drag X and Drag S pod systems, the VooPoo Vinci series, and the VooPoo Drag Max mod. The choice of the best unit depends on factors such as wattage requirements, style, and whether you prefer a pod system or a mod.