I prefer heaters that heat the air, whether fan-forced or convective like the oil-filled type. They're slower to be effective, but they heat the ROOM, not your body, so you don't feel cold on one side and hot on the other like with radiant heaters.
A little off-topic: I've got a pair of 1950s vintage Electromode brand fan-forced portable heaters- 4000 watts each. Yes, they plug into a 220V 20 amp outlet. And "portable" is relative... they have a handle, but they each weigh about 30 lbs.
220 outlets used to be much more common than they are now. In the early days (1950s) of window air conditioners, almost all window units required 220. Even 1-ton and less. So they used to make heaters that used the same wall plugs. I use them in my garage and workshop where I have outlets for 220V air compressors.
The old things are great, although I rarely use them anymore. Built like TANKS. Even the cords are still flexible (otherwise I wouldn't use them at all). They literally don't build 'em like that anymore. Although to my surprise, Electromode is still in business (part of Dimplex) and they sell electric shop heaters that hang from the ceiling.