Is using SQLi less reliable or break easier than MySql?
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No I don't thing so, because it improved version of MySQL and not different database server. and MySQLi is faster thus the name MySQL Improved. MySQLi also supports all of the features of MySQL such as transactions and etc. . The MySQL (not improved) extension will also be dropped from PHP6 (you can still install it, if needed) and replaced with MySQLi.
MySQLi many more differences, that gives more security possibilities, among others,
Dave BaldwinFixer of ProblemsCommented:
This page tells a lot about the different MySQL methods in PHP:

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Mysqli is much more reliable when used proper. Using transactions can greatly reduce chance of changing only part of data (if you are using InnoDb). Using prepared statements can improve mysql queries speed(when you use lots of similar queries) and it does proper escaping for you.

From official mysql manual:

If you are using MySQL versions 4.1.3 or later it is strongly recommended that you use this extension (mysqli).

But there is one downside: mysqli is only supported on php5 and not all hostings provide it.

There is also PDO, witch is usually much better as it can use lots of different databases with small code changes.

TLDR: If you are writing application for php5 it is recommended to use mysqli over mysql.
BlackHairedAuthor Commented:
That was the best answer!
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