This assumes I know the difference as to why I should. Is it better in some way? Is it just more emojis? Are those blue bubbles you mention exclusive and wondrous? I have no frame of reference since I've used only Android apps.
I use it with Google Voice to make and receive calls over Wi-Fi instead of cellular whenever possible. I pay $7.07 a month for cellular while everyone else is running around bleeding $40 a month for "unlimited" many don't even need.