New NAS mirror or raidZ

TrueNAS General
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After looking at the cost of a diskless 4 bay NAS I decided to build my own from my old parts inventory. I purchased a Jonsbo N5 case and a Lsi 9300 16i to go with an i3-6100 mobo. I have populated it with a few drives I had on hand for learning and testing.
Initially, I would like about 8TB of storage that I can expand as needed (I know the N5/HBA is overkill). Should I mirror 2 8tb drives or use 4 4tb drives in a raidz2 configuration? The drive cost is reasonably similar. The raidz2 option seems more expandable but I’m on the steep part of the learning curve:)

I found these new 4tb drives which seem like a good value.
(Western Digital/Dell DC HC310 HUS726T4TALA6L0 4TB SATA 3.5" HDD — ServerPartDeals.com)

Current configuration:
Gigabyte GA-H170M-DS3H mobo
i3-6100 CPU
120GB M2 NVME boot drive
16GB memory soon to be 32GB
Ebay used Lsi 9300 16i
Jonsbo N5 case
3 120GB SATA ssd in a raidz1 pool (have 2 more, may use for common files for multiple PCs)
3 1.5tb WD green hdd in a raidz1 pool (just for testing and learning)
1GB network (TP-Link Omada >100 devices ~75% wireless)
Mostly a single user plus a bit for my wife
A couple Windows PCs, ~12 Linux PC/Rpi and 4 Android devices
50+ IoT devices

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With only 2 users IOPS shouldn’t be an issue on the HDDs so RAIDZ should provide enough.

RAIDZ2 for 4x4TB is better for expandability and redundancy than cf. 2x 2-wide 4TB mirrors - but only if you want to expand with 4TB drives. If you want to be free to use 8TB drives in the future, then mirrors would be better because you can have 3x mirrors 2 of which are 4TB and 1x 8TB.

The WD Green are OK for experimentation but should not be used in production because the microcode is not designed for NAS use.

Make sure the LSI HBA is flashed to IT mode.

Unless you want to run VMs or lots of Docker Apps, 16GB of memory should be enough for an i3 and 1Gb network.

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