It's all psychological. For instance, I've always preferred my soft drinks in a glass bottle. So, when offered a soda in a glass bottle, I always says. Yet, when I'm offered a poured, canned, or plastic bottle soda, I tend to hesitate more. It all depends upon your preference as the consumer.
Now, personally I think there's a reason why the majority prefer glass bottle cokes over plastic bottles or cans. I think that COLD glass bottles taste better because the glass serves as one giant piece of ice surrounding the soda.