I personally wouldn’t use raidz1 because it seems too risky to me. I’d have higher redundancy.

Some links

www.truenas.com/…/raidz1-vs-raid-5-ures.42598/

truenas.com/…/5x-4tb-raidz1-array-rebuilding-with…

magj.github.io/raid-failure/

The last link is talking about actual raid and not zfs. But it has a 50/50 chance with a URE rate of 10^14 to lose the array. Raidz1 maybe won’t have that catastrophic of a failure, but you’d still be rolling the dice on some corruption.