Question:

Virtuous Shaikh, which of the (two) is more virtuous- recitation of the Qur’an or an increase in supererogatory prayer?

Answer:

There is recitation of the Qur’an in supererogatory prayer–It includes prayer and recitation of the Qur’aan. It is more virtuous, because it includes recitation of the Qur’an. Yes.

[Source: http://www.sahab.net/forums/index.php?showtopic=136789%5D