Understanding electric heaters power
Well stoves aren't space heaters.  Remember that.

If you think your stove heats better, its probably due to your stove having 50 AMPS at 240V available to it.  That' 12,000 watts.

Any portable cheap electric space heater that you can plug in to mere common outlets will be limited to 1800 watts, but more often 1200 or 1350.

It's about the amount of energy available

Stoves have bigger wiring, bigger outlets, and access to more power.

In contrast my home electric furnace is hard wired and can draw up to 28,800 watts with an additional 2500 via the heat pump.

What it comes down to is this...

Heaters gonna heat

Install an appropriately sized heater.  If you want more heat you should buy one with a higher wattage rating, and it will probably need to be hardwired.  Don't use your stove for heating.