International SEO domains: Can I only use primary domain to multiple market with different currency?

Shawn512
Shopify Partner
110 2 11

Primary Market: UK

Store Currency : GBP

Other market: USA/CA/AUS
Using GeoIP and Shopify Payments 


My question:

Option 1: use the primary domain for all the English spoken countries (however they use various currency). No subfolders or subdomains.

Option2: use the subfolders for different countries, even they use same language.

 

Which is better for SEO please?

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