two heaters

No simple answer and I don't have the time or the energy to give you a complex one. It depends on many things. Generally when you have two parallel loops attempting to control more or less the same thing, one of them will take over.

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Assuming you set the thermostat temperatures as close as possible to each other one will always end up doing more work than the other but it depends on a lot of factors as to which one. (Obviously If one thermostat is set to start at a higher temperature than the other one can produce in the room before its thermostat shuts down, then the higher set one will never start.)

whichever has the thermostat set lowest will start earlier.

the difference in tolerance between the 2 thermostats as in which cuts in first, and how fast it cuts out compared to the other when the desired temperature is detected, the speed at which the bimetal strip bends in response to temperature change compared to the other one.

One element will also develop more heat than the other due to manufacturing tolerances. Their resistance as they heat up will also be slightly different too

The air circulation in the room, placement of each heater in the room, whether they are both at the same height (one that is lower down will cut out last, all other things being equal) and other things

Surely depends on what the 'stats' are set at. If A is set at 18c it will cut out when the temp reaches 18c. If B is set at 22c it will cut out at

22c. (over runs etc taken into consideration.) Once the temp starts to drop B will come back on and start to heat back up, thus not letting A come back into play. Of course in practical terms there are many variables involved. In theory I would say in a controlled experiment the one heater (B) would end up doing all the work.

Metro...

unless they are set to exactly the same setting once the room reaches the set temperature of the cooler heater the other heater will do most of the work.

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Just a thought... If both heaters were identical, set to exactly the same
setpoint and
in a room where the heat was uniformly distributed, then they would probably
switch on alternately. This would arise because the heater that had just finished
heating would retain some heat due to heat capacity, and so the other one would
be slightly cooler and would reach setpoint faster.