Verdict
Choose ChangeTower when
- Technical SEO matters to you. Can detect HTML/code and SEO-attribute changes, but is not documented as a technical SEO crawler or auditor.
- Team collaboration matters to you. Supports additional team members, roles, group notifications, shared notes and exports, with stronger controls in higher tiers.
Verdict
Choose Google Trends when
- Research depth matters to you. Useful directional topic and query-interest research, without SEO difficulty, backlink, crawl, or SERP-depth data.
- Measurement & tracking matters to you. Tracks aggregate search interest over time, not a site's rankings or content performance.
- Free tools matters to you. The core official site is publicly usable and presents no paid plan or paywall in the fetched page.
Read the full reviews: ChangeTower and Google Trends.