If you actively used the domain before, you may not want to risk someone else scooping it up in TBR. It’s probably a good idea to place a backorder.
Remember, there is no guarantee that your registrar will get the domain for you in TBR, especially if it is a premium domain (e.g. a short keyword).
It’s best to not let your domain expire. Some tips for preventing this are to make note of the dates for any domains you have registered, make sure your contact information is up-to-date with your registrar, and that their emails are getting delivered to your inbox.