I agree! They look almost too good on her. Now I'm just wondering which nude (Pedro/Proenza/Kelly's SP) I could pull off (I'm going to see them irl). Liba (one of my skintone references) liked only Proenza's.
She has very good make up skills, both in applying MU and in picking products that just look stunning on her.
You are a fair NC, right? If so, I'd just stick with WR. I didn't care much for PB. IMO, PB is awesome on the runway. IRL, however, the formula in this color was too high maintenance. You need to apply the right amount of product to make it look wearable: Too little and it will settle in lip lines, too much can easily turn into a thick coat of concealer lips. For a photoshoot or runway, PB has the potential to look stunning. If you go for it, prepare for a lot of touch ups. But that's just my opinion.
My recs: Instead of going for SP or PB, definitely check out RH and get a BU of WR. I have a feeling that you will like it a lot (especially if you are into mattes.)