I have installed mysql from the official ubuntu repository, runing this commands.
sudo apt install mysql-server
Even you can install mysql-workbench. And this is the version, and yes it is the latest.
In the mysql documentation you can install it by installing his mysql apt repositories.
peter@peter-desktop:~$ mysql --version mysql Ver 14.14 Distrib 5.7.20, for Linux (x86_64) using EditLine wrapper
Then, It is a matter of personal preferences or is there some other matter?
If it exist, please share with us the details.
I ask this, because this surprises me that mysql has being up to date in ubuntu 16.04 LTS xenial repositories.