I prefer the second one! The colors are more vivid and unique, and the first one just... kinda looks like a not-too-great vector from the show. Which is impressive if it's your own, but it's much more impressive to see an artist learn to adapt a style and make it their own
I love both, it's not that one is better than the other. It's that they are both different styles, beauty is in the eye of the beholder. If people decide to criticize one, just ignore it. They are looking specifically for the MLP style, which the first one has, but the second one is your own style. You can choose either, great work.