TrueNAS Hardware - Old Server or Modern Consumer Hardware?

Hey, I’m new to building your own NAS and I’m currently looking at building a system with TrueNAS Core. I’m looking at 6x 6TB Drives, plus at least on boot SSD (trying to move away from my OneDrive for speed reasons).

My original plan was to setup a machine with Proxmox (using mostly consumer grad hardware), that’s powerful enough to handle some VMs (hosting stuff like HomeAssistant, Bitwarden, PiHole, maybe an occaisonal web project) and a TrueNAS Core. Then I came across the hardware guide from “ericloewe”, which listing old server hardware.

I understand that it might come with some advantages like an IPMI and on board SATA controllers, but it has me wondering about the performance that these “old” chips might be able to provide.

My second idea then was to go with “old” server hardware (most likely the Supermicro X11SSM-F and an Intel Core i3-6300) for a NAS and have the a dedicated machine to handle my Proxmox setup.

I’m not sure how clever all of this is, can you guys give me some feedback of what you think about my plan?

Guess I should have added a purpose:
I’m working with large amounts of photo, video and 3D data that I need to store. I wanna also allow a backup for a good friend running Synology via rSync.

And talking of consumer hardware: I was looking at an mATX board with some Ryzen CPU, mostly because I need two PCIe Slots (one for a network card, one for a drive controller (something like the Supermicro LSI 9211).