Fewer leak points
Seamless gutters are formed in long runs, so there are fewer joints along each roof edge where water can escape over time.
Cleaner curb appeal
A custom-fit system can look more finished because the runs are measured for the home and installed with fewer seams.
When sectional gutters still appear
Short repairs and some budget projects may use sectional pieces, but full replacements are often a good time to compare seamless options.