This information for WordPress.com is compiled from common positives and negatives found in 3rd party reviews, analysis of available plan data and options and where possible first hand experience/testing.
Official WordPress-hosted solution with automatic updates
Beginner-friendly, no technical setup required
Free plan available (with WordPress branding)
Good security and performance optimizations
Integrated with Jetpack for backups and site management
Limited customization unless on a paid plan
No plugin support on free and basic plans
Expensive compared to self-hosted WordPress (WordPress.org)
Limited control over server settings and configurations