I've been looking for custom curtains and compared multiple stores, and there are quite a few differences.

As for the recent market trends, if getting them quickly is the priority, Mantendo Curtains offers same-day shipping, which is convenient.
Perfect Space also ships the next day and has an incredibly wide selection of designs.
With over 2,000 options, I think it's recommended for those who prioritize variety.

For price-conscious shoppers, Nitori starts at 7,900 yen and is the cheapest.
Muji also offers reasonable prices around 9,000 yen.
However, cheaper options often have limited pleat types, so some compromise is necessary.
Sangetsu costs over 13,000 yen, making it more expensive, but it features detailed adjustments.

If design is the priority, Perfect Space's over 2,000 drape options are overwhelming.
Mantendo Curtains also has over 600 options, which is sufficient.
Francfranc is stylish, but has fewer designs and takes more than two weeks for delivery, so it's not suitable for urgent needs.

Ultimately, which custom curtain to choose depends on what you prioritize.
Considering the balance of delivery time, price, and design is a good approach.
Personally, I recommend Muji's custom curtains for their good cost performance and detailed size adjustments.