Which feature is more important: Simplicity or customization?

Simplicity is major as customization can become to much complicated.

Customization is typically for large enterprise clients and requires separate deployment. Simpler solutions are usually used for SaaS systems, and it's not recommended to start with customization.

Simplicity is more important starting out. Customization is helpful once you have users familiar with your product and want to get more out of it.

Both simplicity and customization are crucial features

Simplicity for the win! Too many customization options can overcomplicate the UX. Focus on the core functionality and make that dead simple. You can always add in a few key customizations later once you nail the core experience.

Simplicity wins out for me. The user experience is key and less is usually more. Customization has its place for power users but a clean, intuitive interface is most important. Keep it simple!

I think simplicity is more important

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Simplicity always. When somthing is simple you can add customization, performance and anything you would like.