What is difference between Bitrix64 and Odoo CRM?

Here is a basic difference of any closed source CRM (Bitrix, MS Dynamics, ZOHO CRM, Suger CRM etc) & Open source CRM (e.g. Odoo, Orange etc)

There will be no licensing terms and you will own the system.
You’ll have to rent/own infrastructure and yourself will be responsible to manage it.
You have full rights to customize it as you will have the source code.
You can establish your own business process on rather than accepting already established process of some software.
TCO (Total Cost of Ownership) might be more than hosted ones. It might have bit more operational cost.
Export the data and migrate to some other software will be easy as you own that software.
Data privacy and confidentiality will be maintained.
You will have built in website already connected with CRM/backend (Tight coupling)
Extensibility of having accounting, sales, purchase, payroll, inventory on a single click installation without any extra cost.

No/little setup cost
You don’t need to worry about infrastructure and maintenance.
You will not own the software and will need to accept the licensing terms.
Very small customization might be allowed.
You will need to adopt the business process (workflow) of that software.
Migration to other software in future might be difficult.
No TCO (Total cost of ownership) as you will not own the software.
You will need to write/develop middleware interface to connect with any website (Loose coupling)