Crack repair
Describe the crack, where it is, whether one side is higher and whether it has changed. Patching may help a stable surface defect, but it does not stop movement below the slab. Ask why it cracked and what the proposed repair can reasonably do.
Cracks near the home, doors that no longer fit, or a widening height difference deserve an on-site assessment. A contractor may recommend a structural or drainage specialist. Do not treat an online form as a diagnosis.
Leveling a settled section
Leveling may be an option for some settled slabs. The contractor needs to inspect the slab, support below it, access and nearby utilities. Ask how they will check the cause of settlement and whether lifting could affect connected surfaces.
Resurfacing a worn slab
An overlay can change the surface of a sound, prepared slab. It does not turn a weak or moving base into a sound one. Ask about surface preparation, existing coatings, moisture, adhesion and how cracks may show through later.
When replacement belongs in the comparison
Extensive movement, poor drainage, widespread damage or a failed base may make replacement worth comparing. Request separate scopes so you can see what patching, leveling, resurfacing and replacement each include.
Phoenix sun and hot surfaces can affect repair product application. Ask about suitable temperatures and curing instructions for the specific material. The product label and site conditions matter more than a generic calendar.
Read the cost guide; small repairs are often priced by the job rather than by area.