Oil filled are the safest space heaters out there. Same heat across a larger area. They do take a long time to heat up (and cool down) but are silent which is nice. I have no problem sleeping with them on or leaving my RV with them running.
Just be sure to keep things away and monitor the cord and outlet to be sure they are in good shape.
As someone pointed out they do take up a lot of space. I found a smaller 750 watt one that is very compact and works great in the bedroom.