Any reason why it's between just those two?
The new Alphamine is more of an energy drink type product. The OG Alphamine was a good product though.
Have you looked into OxyMax XT at all? It provides great euphoric mood enhancement, appetite suppression, clean energy, thermo.
I've never tired the new Alphamine, but the old one is a good product (I have a tub of it now). It and OxyMax XT are the only fat burners I've used, and I find they both provide nice appetite suppression (especially useful during long days when I don't have time to eat, even when I'm not cutting).
I wonder if VS may have the old Alphamine still in stock at some stores, if they carried it at all.
You could always make your own stack though. I know VS sells caffeine and yohimbine HCL, which go well together and are effective. I think they also sell synephrine you could add as well. They also sell forskolin, which can help with fat loss too.
I'm not sure how much you have on your gift card to spend, so that may also determine what you can afford there, as prices at physical stores tend to be higher than online.
Edit: I see that VS online seems to have the new and old Alphamine. As far as what VS has, the old Alphamine is a good choice.