I've worked with Sonnet stuff before, but never OWC. If you're really concerned with reliability between those two devices I'd go with Sonnet. Here's why...
The most likely thing to fail in either enclosure is the drives. With OWC selling dirt cheap, and I mean CHEAP you can pretty much guaruntee they are not testing their drives. Buy, pack, ship. Usually, with companies like Sonnet you are paying extra for someone who knows what they are doing to test drives and give you a much higher success rate, when it comes to lot getting a lemon.
Nate Cooper
nate.cooper@promax.com
949.375.2738
Scuba Dive?
http://www.postproductiondivers.com/
I support:
Xsan
MXFserver
ShareMAX
EVO/SANmp
Facilis
MetaSAN