Migrating Existing Custom Emails to G Suite

Happy New Year.
I have 2 new sites on Squarespace (domains hosted on GoDaddy), each site with their own custom email address (info@domainname) currently hosted on BlueHost. I am looking at moving the 2 custom emails to G-Suite (Google WorkSpace).  
I am wondering if I should purchase my G-Suite acct directly through Google or through Squarespace? 
Besides centralized billing & the offer of a free yr of G-Suite through select plans, are there any other advantages of purchasing via Squarespace? 
Are there G-Suite limitations if I purchase via Squarespace? (For example, rather than creating 2 G-Suite accounts, I am hoping to create one & have the 2nd email available through an Alias domain/email).
Are there Squarespace limitations if I purchase G-Suite directly via Google?
Thank you for your time & help.
Lorrie