Ruan Mei vs Tribbie

From what we see in most v1 showcases the preferred support is Tribbie. Apart from the extra damage she brings is she too big of an upgrade from RM as far as buffs go? Asking this because I haven't seen any posts comparing those two and I am sure people -including me- want to know if we should account for Tribbie pulls in our savings. I am aware that v1 till release is a big distance to cover and things will probs change a fair amount but I am asking this to anyone who may have any idea from hands on experience.