Quick answer: A pre-tied obi can reduce dressing steps; a self-tied one offers more flexibility. Choose by your practice time, the event, and the construction of the actual product.

A ready-shaped bow can be appealing when you are learning to wear a yukata. Yet both styles must fit securely and feel comfortable through the activity.

Compare them under the same conditions

If possible, wear the same yukata with each type of obi. Time the dressing process, note any extra ties, inspect the back view, then sit and walk. With a pre-tied style, test how the shaped piece attaches and whether it survives packing. With a self-tied obi, check the length, fabric, and whether you can repeat the knot from a guide without help.

Include the day itself

If the event is soon and you have little practice time, choose a design with clear steps you can already follow. If you expect to wear a yukata often and enjoy changing the look, practicing with a self-tied obi may be worthwhile. Either way, do a complete rehearsal with the necessary fasteners.

For travel, pack the set as you would on the day and check the obi after unpacking. A pretty bow in a photograph does not tell you whether you can secure it at your destination.