Short answer
A breaker cracks material away; a drum cutter mills it from the surface. In bulk excavation the breaker is faster and leads on most jobs. A drum cutter takes the lead in three situations: where vibration is limited, where the cut surface has to follow a defined profile, and where material behaves too plastically to propagate cracks. The decision is not "which is stronger" but what the project demands of you.
Two tools, two different physics
A breaker starts a crack in the material with impact and removes material as the crack runs. In brittle material this is extremely efficient; the energy goes into fracture.
A drum cutter mills continuously from the surface with picks on a rotating drum. Energy goes into cutting rather than propagating cracks. That is slower, but it generates no impact vibration and leaves an even surface.
That difference shows the two are complementary rather than rivals. On the same project, bulk excavation can be done with a breaker and profiling and finishing with a drum cutter.
The three situations where a drum cutter leads
- Where vibration is limited: demolition next to a structure in use, historic fabric, near hospitals and laboratories, close to buried services. With no impact, a drum cutter transmits no impact vibration to neighbouring structures.
- Where surface profile matters: tunnel profiling, slope trimming, trench walls, cleaning foundation faces. A breaker leaves an irregular surface; a drum cutter gives the section you specified.
- Where material behaves plastically: clay and frozen ground do not propagate cracks, so a breaker tool buries itself and produces little. A drum cutter cuts this material away.
- The output is also finer and more uniform in size, which makes loading and haulage easier and on some jobs suitable for backfill directly.
Where the breaker stays ahead
In bulk excavation and hard rock a breaker is markedly faster. In secondary breaking at a quarry, in foundation excavation and in general demolition, switching to a drum cutter lowers output.
On cost the breaker is also ahead: tool consumption is more predictable than drum cutter pick consumption and cheaper per unit.
In abrasive, very hard rock drum cutter picks are consumed quickly, and that is the item which most often upsets the calculation on site.
The question that decides it
Ask this: on this job, is what limits me speed, or is it vibration, surface quality or how the material behaves? If speed is the limit, use a breaker. If it is one of the other three, use a drum cutter. Any comparison that skips this question and starts from "which is stronger" ends up in the wrong place.
Transverse versus axial drum cutters
Transverse (twin drum) cutters sweep a wide face and are preferred for profiling, slope trimming and surface removal.
Axial cutters are strong at opening a narrow, deep section and come into their own in trenching, confined excavation and natural stone work.
The choice between them again follows what the surface has to be: a wide, even face, or a narrow, deep section?