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For Panatlantica's customers, Drupal 6 means, i.a.:
- Increased scalability
- More mature code base
- Optimized for high performance
- Integrated i18n
- More complex web application due to new Triggers and Events system
If I (ccharlton) could recommend a 5-point version:
- Scalable and Stable
- Really Friendly Interface
- Multilingual Support
- Tons of Modules & Themes
- World Famous Framework & Community
- Please include: "Easier to use!" (cryptonomikon).