As for the benefits for a 0 accuracy Nexus? I'd say it's the everyday BLM staff. The accuracy one is slightly stronger, and a bit cheaper for melding.
But, it does require upkeep of Sachetorte in coil, which isn't cheap to buy, although being rather cheap to make, at least on my server.
The no accuracy Nexus has benefits for if you're doing things like your Expert Roulette, SB parties (Why? You're done), helping a friend get their relic.
All the little things you love your BLM for when you aren't coiling.