User blog comment:Da1dx/Free Unit of choice! Whaaaaaaa!!!???/@comment-8764007-20161024171531

In general, I would recommend _against_ picking the following:
 * Any starter unit, they are available in honor summon fairly frequently. Of course it seems you have them all anyway.
 * Any global exclusive, they can be obtained every so often in global divine resummons which contain a limited pool (Allanon included) and allows you to get a better selection since you can resummon dupes.

It sounds like you're relatively new to the game. If you like quests, I highly recommend Laberd. With his extra mitigation and BC-on-hit LS, He's gotten me through a lot of tough content.