Choose badminton shoes by court and fit
Check the sole, distinguish size from shape and compare both shoes before choosing a pair.
Start with the hall
Ask the venue which footwear it accepts. Check the exact model's indoor use and non-marking specification. ASICS describes its squash and badminton range as having non-marking soles. That is a useful specification to look for, rather than assuming any sports shoe will suit the hall.
Keep the venue's answer with your shortlist. A product description does not replace its admission rules.
Separate size from shape
Yonex's badminton FAQ explains that shoes with the same labelled size can feel different because of their shape and construction. Start from the chosen model's size guide, then try it.
Width options deserve a separate check: Yonex's 65 Z announcement lists Slim, Women, Men and Wide versions. These are options for that range, not a sizing system shared by every brand.
Try the complete pair
Bring the socks you play in. Seat each heel, adjust the laces evenly, then stand in both shoes and take a few steps where permitted. This follows Yonex's fitting advice.
Notice heel movement, pressure across the forefoot and contact at the toes. Tell the fitter where something feels wrong. Do not turn an uncomfortable fitting into a test of how tightly you can pull the laces.
Compare with a short checklist
ASICS's badminton footwear guide highlights grip, cushioning and ventilation. Use these as questions to explore, rather than a score proving which pair is best.
For each candidate, write down the model, labelled size, fit version and your observations. Compare under the same fitting conditions. Colour can break a tie once the practical checks are satisfactory.
Leave with something you can repeat
Before deciding, explain your choice in one sentence: accepted by the hall, suitable fit, and no unresolved problem during the permitted trial. If a check is unclear, keep looking or ask the shop.
Keep the box reference and your notes. Confirm the seller's exchange conditions before buying, especially online. A brief fitting cannot establish long-term comfort, durability or match performance; those are observations to make during use.