The short answer
Service pages are for people ready to buy. Blog posts are for people researching a problem. You need both.
A service page should target a commercial search like "website redesign Albuquerque" or "booking system for barbershop." A blog post should answer questions like "why is my website not getting leads" or "how do I reduce no-shows at my salon."
What service pages should do
A strong service page should explain:
That is why the service pages on this site include problem lists, build lists, use cases, process, FAQ, pricing context, and schema.
What blog posts should do
Google says useful content should leave readers feeling they learned enough to achieve their goal. A blog post should not just exist to stuff keywords. It should answer a real question better than a short social post could.
Good blog topics include:
How they work together
The blog supports the service page. The service page converts the buyer.
Example:
That internal link gives the reader a next step and helps search engines understand which page is the main commercial page.
What not to do
Do not publish 100 shallow posts just because you heard "fresh content" helps. Google specifically warns against mass-producing content primarily for search traffic. Publish fewer, better posts that match real customer questions.
Bottom line
Use service pages for buying intent. Use blog posts for education, trust, and internal links. Together they build topical authority around what you actually sell.