Template development is suitable for those cases when absolutely all functionality and visual part correspond to desires. To be clear: in some templates even increasing the font and changing the blocks places can be a problem.
Pros Cons
Relatively inexpensive. Standardized design.
Quite quickly. Complexity of modifications.
You can take a preview. The probability of buying a low-quality template.
Large selection of templates. May be unstable under high loads.
Exclusive development
Hand-assembled from a variety of parts latest phone number database that you can model yourself. You can make a convertible or a truck, paint it in 7 colors of the rainbow or come up with a textured coating - any of your imagination.
Exclusive development is applicable where it is necessary to distinguish oneself with design, create non-standard functionality, automate business processes, if there are some complex integrations with external services or interactions between users. This is the most complex type of development in every sense of the word. Sometimes not even every developer is ready to take on such projects.
Pros Cons
Unique design. Expensive.
Ideal structure. For a long time.
Individual solutions.
Reliability and flexibility.
System integration.
Primary SEO optimization.
Conclusion
Despite the predominance of advantages of exclusive development, in fact, there is no winner. Each type of development is good in its specific case. Experienced developers will advise the one that suits your project to the greatest extent, but the final decision is always yours.