When selecting a heater, focus on these four key factors—usage scenario, heating method, safety, and energy efficiency—and you can essentially avoid any pitfalls. Simply follow the guidelines below to make your choice:
I. First, Determine Where You Will Use It (This Decides Which Type to Buy)
Priority: Bedroom Use (While Sleeping) — Oil-filled radiators, baseboard heaters, or convection heaters. Advantages:Maintain a constant temperature, produce no airflow, do not dry out the air, and operate silently; you can leave them running all night without getting a headache. 
Priority: Large-Area Heating (Living Room) — Baseboard heaters or high-power rapid-heating units. Advantages: Circulate heat throughout the entire room, do not blow hot air directly onto people, and offer a high level of comfort. 

Priority: Rapid Spot Heating (Feet/Desk Area) — Fan heaters, "Little Sun" radiant heaters, or carbon fiber heaters. Advantages: Provide instant heat upon startup; they are inexpensive and compact, though they only warm a small, localized area.