The answer to 'which is better leak repair or' is that leak repair is generally better than roof replacement for most homeowners. Leak repair is a more targeted and cost-effective solution that addresses the specific source of the leak, while roof replacement is a more extensive and expensive project that replaces the entire roofing system.
Leak repair is typically faster and less disruptive than a full roof replacement, and it can often be done for a fraction of the cost. It's a good option if the leak is isolated to a small area of the roof and the rest of the roofing system is in good condition. Leak repair can also help extend the life of your roof and postpone the need for a full replacement.