On single format - yes, that doesn't really matter. The only diffrence is just in 5 accuracy and we swap name of new usually used move... thats it...
If we think also about Spore... well... That one is actually blocked by SOMETHING... not only Insomnia/Vital Spirit/Magic Bounce (that one countered by Mold Breaker)/correctly predicted Magic Coat/Poison Heal and activated by Toxic or Flame Orb Guts/Lum Berry (but here just one time UNLESS you have Harvest or something like that)... but also Sap Sipper (due to grass typing, that one can be ignored by Normalize Spore or Mold Breaker), Overcoat (it's powder move), Grass types (again - powder move), Safety Googles (again AGAIN - powder move)...
But on bright side (and this is something what makes this move worth using sometimes over Dark Void (and in new gen - Lovely Kiss)) accuracy is perfect. There is no way you could miss Spore unless drop in accuracy or Bright Powder on oponent... Or Evasion, but that one will be REALLY rare with banned evasion moves...
Can be used with Prankster and Mold Breaker more easier. Heck, even with Sap Sipper it might be interesting just in case we do take move back because of unexpected Magic Bounce (I used myself Sap Sipper on Swampert-Mega with Spore. And it works out preety well).
On Double format... that actually matter a lot...
Obviosly we mainly talk here about single format, but it's worth mentioning the fact, there was option to play on Double BH when that format was choosen for OM of month... Now you need Specificaly Darkray for this move, and even then there is still accuracy drop... Darkray could run No Guard if this pokemon want, but that means no Prankster if oponent prefer to make sure this move actually land. Similar to Mold Breaker for passing Magic Bounce (funny enouth, that nerf actually puts Darkrays ally into 50/50 chance to dodge bounced Dark Void, because Darkray using No Guard always will took that status back no matter what...).
The point is: Dark Void on BH Doubles might see still some plays, but now you most likely are sticked to one ability what makes this move really effective... If you choose something else, be ready for that sweet misses...
But no matter how shaky accuracy is on sleeping moves, Sleep Clause should be implemented in next gen no matter what... really...
Every competetive metagame (AG is the only expection, but hey - thats format where Evasion is allowed, so...) have Sleep Clause, because it was needed in every metagame. In BH - Especialy with easier distribution in sleeping moves, it should be implemented as well. It doesn't matter how many sets counter sleeping, we always need some of them to be not completly shooted down by status spreader...