The answer to 'shingle replacement vs' is that shingle replacement is generally more cost-effective and practical than a full roof replacement in many cases. Shingle replacement involves removing and replacing the worn or damaged shingles on your existing roof, while a full roof replacement involves tearing off the entire roof and installing a brand new one.
Shingle replacement is often the better choice if the majority of your roof is still in good condition, as it can extend the life of your roof at a lower cost. It's also a faster and less disruptive process than a full replacement. However, if your roof is more than 20 years old or has widespread damage, a full replacement may be the better long-term investment to ensure the integrity and longevity of your roofing system.