Here is some additional information on the behavior from testing different Quote Types , based on current design:
have tested this thoroughly for all possible quote types and noticed the following
For the scenario
Existing Billing Account, New Subscription Quote flow Unless all information in a contact record matches on both Zuora and SFDC end. the BIlltoContact and SoldtoContact will come as blank
For Amendment and Renewal Quotes flow If all information in two contacts are exactly same except for the email address, Both Renewal and Amendment quote Flow by default is picking up the other contact.
Currently zuora will just use full name (First name + Last name) to mapping the bill to and sold to contact when you create a renewal quote.
If there are multiple contacts with same First name and Last name in one account, we just pick up the first record returned from the query, and the order of query is the default order by SFDC. (so maybe renewal quote's default sold to and bill to contact is different from the contact you select when you created the new quote.)
But send to z-billing will use the right sold to and bill to contact in zuora, cause we will use the sold to and bill to contact id in billing account object but not the contact you select from quote page, unless you click <Update Zuora Account Details> button.
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