The biggest difference I think is that the texture of the stool is generally thicker. This leads to less empty times and better wear time with less skin issues (had some with the loop, none with the end). It is just easier to seal oatmeal as opposed to water(exaggeration to make a point) Additionally, I for sure have less hydration problems.
That said, when I had the loop I had concluded that I could live with it. That made the decision to go back to an ileo easier. That many people said an end ileo was so much better than a loop, did not really play a part in my decision because my loop was OK. The fact that my end ileo is easier to manage than my loop was the icing on the cake, so to speak.