Forget ceramic type ones as they don't heat much, only what is next to them, a fan heat for overall and quick warm up is good but if you want to leave it on overnight either an oil or non-oil filled radiator, or a convector heater but these tend to be bulky.
No matter what type you decide on it's the rated wattage that determines how much heat they give out.. not whether it's blown, convected or radiated..
Pros and Cons
Fan.. quick to heat up and circulates the warmth quickly... downside, noisy during the night as they click on and off .. even so called quiet ones.
Oil Filled .. silent and gives a nice background heat.. but slow, heavy and bulky
Convector.. silent and also gives a nice background heat .... bulky.
I would also caution against using leaving ANY portable heater untended.. ie while asleep.. they can all develop faults and catch fire.. your insurgence won't cover that .. but you may never get to find that out..
If you need overnight heat, better to use the installed heating.. or .. use an electric blanket..