Comparing Xen and SeL4 (QubesOS)

How does SeL4 compare with a hypervisor like Xen? Does it have a smaller attack surface?

What would it take to replace Xen with SeL4 as part of QubesOS?

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What would it take to replace Xen with SeL4 as part of QubesOS?

Sounds like this is something https://trustworthy.systems/projects/TS/makatea aims for.