I've been working on a website that sells a variety of mobility and health related products. The website has around 15,000 pages in total, but the brand is soon to launch a new service for money-related services (under the same brand). My question is, should we buy a brand new domain name (brandname-money.com), or should we host it under a subdomain (money.brandname.com).
Both of these websites will be using completely different CMS and layouts, so I've been more inclined to go towards the subdomain route - although I've not often seen subdomains rank that well.
An example of a website that I've seen making use of subdomains is the UK brand ASDA. They have:
I understand that a subfolder would ideally be the best way, but it wouldn't be a good user experience for somebody to land on a subfolder with a completely different layout, CMS etc. I'd love to hear your thoughts.