Best server environment for my newest client

So this morning I received some great news, a contract I have been trying to get looks like it is coming my way.
I need to rebuild an existing website with an 84000 page front end, and a backend that controls the entire thing.
It is obviously a very dynamic website, where there are really only about 10 page templates that will pull different content to create the end result.
The existing site shows 244gb of data on disk with a 13gb database.

So I am going to be doing all this Wappler, question is if @George, @Teodor and @patrick had to advise what would be the most compatible or rather fastest components / packages to use.

The server is theirs for now so i have to start off using that, the choices i do have though are
PHP
PHP 5.4
PHP 5.5
PHP 5.6
PHP 7.0
PHP 7.1
PHP 7.2

MySQL
MariaDB 10.0
MariaDB 10.1
MariaDB 10.2
MySQL 5.7
MySQL 5.6

While I am inclined to imagine that the fastest versions would be the latest versions, and inclined to think that the latest Wappler would be most compatible with the latest of each package, I figured I best check before I begin to make sure this works flawlessly with Wappler.

Any advice is welcome, I have never dealt with such a large website or database for that matter so really want to make sure it is stable, fast, secure, etc.

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