I'm not sean but I see that this question has never been answered.
Kefir offers different benefits than regular probiotic supplements and probiotic supplements offers benefits that kefir does not as well.
Kefir is great for anybody whether you have candida or not (unless you cannot handle it, and it's a pain to make every day as well). Not all probiotics are created equally 60 billion, 200 billion probiotics in a pill aren't necessarily the same as ones that have 1 billion. It's not just the quantity of probiotics, but the quality of the strains of probiotics are important.
Often times the ones with super huge numbers are just marketing, so make sure to take a really good probiotic supplement if you're not going to take kefir.