What are the strains of bacteria in the probiotics? What's the bacteria count? What are you using them for? Does the bottle give a guarantee about viability?
I order all of my probiotics online because I've found better brands and often, better prices, than from a brick and mortar. I personally prefer live bacteria over freeze dried because they generally have a higher bacteria count. However, I use Culturelle, and it is freeze dried and widely considered an excellent probiotic.