If you're talking about actual functional difference, there's very little overall. The little extends to changes such as different warranty periods, firmware differences that supposedly enhance compatibility, Spatial balance checks, etc. Which all in little bits help in a unit that's running 24x7 etc.
If you're talking about if they're more likely to fail over another. Well... That's just based on luck.
I have a Quantum Sirroco and Fireball (2.5GB and 8GB) from 96 and onwards. Nearly 20 years old. Still going. On the other hand, I had some Maxtor's that failed in moments. And in another thread, there was a forum member who had some Red's die in unison for them. Despire the chances of that being highly remote.
Personally, I'd stick to the Red if using as NAS. The warranty would be the big thing for it compared to the others IMO.