The closest show I can compare Wentworth to is Orange Is The New Black. I prefer Wentworth because the story is tighter.
One a side note I just watched the new show Kiefer Sutherland is in. I usually avoid network shows these days but this one has potential. The pilot was scattered storyline wise but it is promising. Name of the show is Designated Survivor. I don't think it's going to be a "must see weekly" type of show so I'll probably just wait until it comes out to Prime or Netflix. Only "must see" shows I keep up with at the moment is Halt and Catch Fire and soon, The Walking Dead.
Wentworth is a drama and is different from OINB. Much less sex and nudity and not humorous.
I really liked Designated Survivor. We are getting it the day after on Netflix in the UK.