I don't think there is that much difference between the 2 formulas other than the + is so much more pricey.
I love the original Proactiv products. I hope they don't discontinue them. I especially like the toner. It is soothing, does not sting or burn. I can't tell you how many friends and family members of mine use this toner, all by itself because of how I have raved about it. People that don't even have acne love this toner.
If you compare the ingredients, amount in the bottles/tubes and prices, you'll see, there isn't that much difference. I'm oily, so having a moisturizer vs. a toner being a core component in a kit, is not a good thing for me. I'm not a big fan of moisturizers anyway. I don't use one that often.
I like the original Proactiv kit and for the money and the results, I'd buy that one, if you're giving this person a gift. It would be around $50 for all the core products and that will last her a while. That's so very thoughtful of you to give her something to help her acne. I am sure she will appreciate it very much.