Since I'm not an expert, I went with FreeNAS. It's largely "ready to go" out of the box, and having a GUI makes things very discoverable. Even if you're comfortable with CLI tools, you might not be familiarized with all the tools used in a typical NAS setup. Heck, you might not have much devops experience, which could lead to overlooking a key detail, such as setting up regularly scheduled scrub and SMART tests and having it email you if anything requires your attention.
Even if you're well versed on these topics, I'd still suggest trying it out on a VM, or at least reading through their guides. Seeing the approach taken by someone else might help you refine your own setup.
Unfortunately, the last few months haven't been great for FreeNAS. They had a horribly botched release. It was killed off fairly quickly, but a few people got burned over it. The good news is that they changed their mind on their expected breaking changes. Initially they intended to kill off jails in favor of docker, which made it a painful upgrade process for some existing users. From an outsider's perspective, it looked rush. Even though I'm happy with my setup, it made me a little more weary about quickly adopting major upstream changes.
Even if you're well versed on these topics, I'd still suggest trying it out on a VM, or at least reading through their guides. Seeing the approach taken by someone else might help you refine your own setup.
Unfortunately, the last few months haven't been great for FreeNAS. They had a horribly botched release. It was killed off fairly quickly, but a few people got burned over it. The good news is that they changed their mind on their expected breaking changes. Initially they intended to kill off jails in favor of docker, which made it a painful upgrade process for some existing users. From an outsider's perspective, it looked rush. Even though I'm happy with my setup, it made me a little more weary about quickly adopting major upstream changes.
Go with FreeNAS 11.