Help- Reading Core Program

My Elementary school (K-6) is in the process of beginning to look at a new Reading Core Curriculum and I was wondering what everyone is using and what they like or dislike about it. I am also wanting to know what questions to ask other schools as I go observe some other curriculums in use. And do you have any checklists or ideas for what we should use to evaluate the different curriculum's we look at? Just looking for some general advice. We have a pretty weak Core right now and we are wanting a much better one this time around so I thought I would reach out to my PLN. Thank you ahead of time