The short answer
Leveling preserves the existing slab; replacement removes and repours it. The right decision depends on slab condition, desired appearance, downtime, cost and the cause of movement.
Choose leveling when the slab is sound but settled
Consider replacement for severely broken or deteriorated concrete
Compare disruption and curing time
Do not ignore drainage or support problems
Common questions
Is leveling always cheaper than replacement?
Often, but not always. Very small replacement jobs, severely damaged slabs or projects requiring extensive prep can change the economics.
Will leveled concrete look new?
No. It keeps the existing concrete, including weathering, stains and most cracks.
Use this information to compare quotes
Ask each contractor what material will be injected, how the original cause of settlement will be addressed, what is included in patching and cleanup, and what conditions are excluded from any warranty.