I like my QNAP NAS boxes.
QNAP looks like they make a huge confusing mass of product but they have pretty much four variants.
Intel or ARM cpu & internals
Tower or rack mount
The same OS loads up and runs on the variants.
Beyond that, you just add drive slots as you need them.
QNAP *says* that if you want to do multi-streams of real-time HD video encoding, you should spend a few extra $$ and get the Intel powered units. But they don't prevent you from trying to run video encoding on an ARM-powered system and the few times I've tried it it worked just fine.
I have a set of 4 drive, ARM powered desktop/tower units. They run very cool and quiet.
I also like that QNAP uses a standard filesystem, one that just about any other NAS or computer is able to read (ZFS). Some of the other NAS makers use a closed source in-house only filesystems that would get in the way of being able to do disk/file recovery in case your NAS boxes fail.
QNAP has a load of add-on apps for just about anythinng you'd want or need to do.