What is the best way to create websites of one company with different directions?

Question

Domain Name System

Good day.
I will briefly describe the situation: there is a company that sells (let's say mobile equipment) and services (for example, repairs). Both directions are important, and it is
difficult to name which one is the main one. The task is to develop sites with different directions. Which domain distribution scenario is best suited for this in terms of SEO promotion?
Options:
1) 2 sites and a redirect from the main
example.com (301 redirect) -> store.example.com
service.example.com
2) 3 sites:
example.com - cross page
store.example.com
service.example.com
Or maybe there is another option? I would also be very grateful if you have examples of such implementations.

Answer 1

The search engine will identify them as 2 different sites.
example.com - Internet shop
service.example.com - Repair.

Answer 2

It all depends on the content on both sites.
In general, it is better to make two different landing pages, on different 2nd level domains, and at least with different phones.
But not the fact that your case is common.

Answer 3

Look at the competitors in the TOP) How websites are made for those who also offer both goods and services in your niche.