Have you tried knitting with either of them? That's really the most important, getting one that feels good under your hands. Because the Addi's were my favs and everyone said the Options NI were most like Addi's, it sold me...and it's true, they're very similar, I think.
That said, I was just talking with my SIL this morning, who has the Denise set. She said now that she's owned them a while, she wishes that she had the Options instead, but can't justify buying them when she has the Denise. She knits lovely things with them anyway.
So if you can, try them out and see if you like one over the other. If you like metal over plastics or resin or whatever the Denises are made out of, then I'd get the Options -- which is what I did.
For me, because I really prefer metal over anything else, it was fairly easy once I found out they were close to Addi's.