From MTA Default DB to SQL?

[Cronoss]

I've been working on a login system lately, and I want to ask, wich is the best way to save the data from the player? All the code from my resource it's using "getAccountData" and "setAccountData", so I didn't use SQL. My problem is that, I should've asked before starting, because I suppose the process from "saving in MTA default DB", to "SQL DB" it's complicated... is it possible to start transfering the data to a custom SQL in that case? if the answers is positive, I should use SQLite or MySQL?

 

(Example of what I mean with "saving in Default MTA DB")

function logHRP(user, password)
	cuenta = getAccount(user, password)