Fire pit or chiminea or outdoor stove?
You're not going to heat the patio significantly either way - the hot air will rise, there's no ceiling to contain it.
Radiant heat is about all you'll get, and that is pretty similar between open fire and stove - the major improvement in efficiency inside is from using less excess air that simply goes up the chimney, and trapping more of the heated air inside the house - but outside all the heated air inside or outside the stove or fire is going to go up and away from people.
If you are into large complex projects you could follow the Romans and build a &quot;stove&quot; under or around your patio (hypocaust ala Romans, or more modernly a &quot;rocket mass heater&quot; in the wall or seat form.) That gives you a larger area of lower temperature radiant heat than a bare fire.