I tried Textra but the problem I had with it was that yes you can block numbers, but I could not find where to go to the "filter box" to see what was filtered and read the messages. See our system sends me a token when I need to log in, but it also sends loads of other messages that I dont need, so I need to filter these SMS's based on the number it comes from, but I also still need to be able to read the messages with my tokens in it. GO SMS Pro seems to fit me better.
I understand, don't have much to filter so never really checked that side of the App, Go SMS Pro is a great app as well.