what stove puts out the highest convection temps
Whichever stove is wasting the most fuel.
You wouldn't ask that question...the question is...How many BTU/hr. is my heating load?, And what (size) stove does that require?
One can make a stove the size of a soup can to hold at 1000 degrees...but no way it can heat your whole house throughout the heating season.
But one can make a stove the size of a oil drum to hold at 200 degrees and heat your whole house easily throughout the heating season.
These are obviously extreme examples, but hopefully the point is understood.
The stove must match the load while the stove is working within it's designed temperature range.