We only use a BOC and timeline book (Wonders of Old, I think is what it’s called) because we do not have any room for a wall timeline. We do have a sewing board that we had made into a timeline when we used the Mystery of History but it was a pain to get it out just for history lessons (I had no place to just let it hang on a wall). I think it depends on the type of wall space you have, if you have a school room (which we don’t), and just your preference.
I am very visual but timelines really mess me up. We’ve been using a BOC, like I said, and for some reason that has worked out best for me and my dc to keep events/people straight (well, as best we can, LOL).