The answer to 'which is better roof repair or' is that roof repair is generally better than full roof replacement, if the damage is not too extensive. Roof repair is a more cost-effective solution that can extend the life of your existing roof, while replacement is a major investment that should be considered when the roof is nearing the end of its lifespan or has sustained significant, widespread damage.
Roof repair is ideal for addressing localized issues like leaks, missing or damaged shingles, or minor structural problems. It can be done relatively quickly and at a fraction of the cost of a full roof replacement. Roof replacement, on the other hand, is necessary when the roof has reached the end of its useful life (typically 15-30 years depending on the roofing material) or has experienced major damage that makes repair impractical.