Both reduce database load, but tradeoffs differ.
Quick comparison
| Feature | Redis | Memcached |
|---|---|---|
| Persistence | Optional | No |
| Features | Rich | Minimal |
| Complexity | Moderate | Simple |
| Popularity (2026 WP) | High | Moderate |
Choose Redis if
- You want richer control
- You use the Redis Object Cache plugin
Choose Memcached if
- You want simplicity
- You prefer stateless caching
Related
- Setting up Redis object cache for WordPress — Redis setup
- Performance tuning for WordPress on Ubuntu + Apache + PHP-FPM — broader tuning