yes, it depends a lot on your specific requirements and the disk count in the NAS.
Physical disk failure is a minor concern (with quality drives) today and the lower Raid levels don't offer much advantage or rather the opposite by increased wear.
Also to consider is factory faults mostly show up in certain production charges and one usually buys from the same lot. Thinking of the 2 drive versions here.
With 4 or more drives and online swapping capability it's a different story.
I just wanted to mention it because the difference can be a big one.
But whatever strategy you choose, Synology has you covered. I was really sceptical for it's Linux heritage, but eventually had to admit they did their homework better than Apple.
At that time we also had 2 MacMini Servers as an 'option', but they never got engaged.
ps: after some trouble finding back the PSU in the attic my own DS214 is running again and serves the old Mac fellas well. 500MB in one minute is quite ok with me.

Now data may flow from OS-9 to IOS to OSX to WinXP to Win7.