al-Salamu `Aleykum,
A brother opened my eyes to a thread from SC, called:
"Are Shia Aalam's Qur'an Different Than Sunni?"
In which the Shia member says in the opening post:
"I have noticed a difference in how Shia scholars recite Qur'an vs. Sunni Scholars. Essentially, Shia scholars seem to use a sweeter voice and almost sing the verses. I noticed that Sunnis scholars reciting Qur'an extend the transition (fairly long) from one ayah to the next and use a more muffled tone. I prefer the Shia recitations more, they allow me to focus on salaat more and less about the style of the recitation."
I'll leave the people of Qur'an to comment on this part above, what interested the brother were the words of the Moderator:
If I were to comment on the above I'd say the following,
Firstly, Ahlul-Sunnah recite the Qur'an better almost all the time, and if we say 99.99% of the time we wouldn't be off by much.
Secondly, as far as Shia understanding the Qur'an better, this is what is incorrect, how can people who busy themselves reciting Ziyarat Ashura and other such trivial texts know more than the people who consider the Qur'an the center of their world, and recite it day and night?
The Shia are the weakest when it comes to "understanding" the Qur'an, their books of Tafseer, such as al-Qummi and al-Safi and the like, they are a testament to this fact.
Suddenly the "Lamp" in the verse turns into the Imam, the "Believers" are usually reduced to Ahlul-Bayt or `Ali (ra), The river of "Kawthar" for no reason transforms into Fatimah, the Surah beginning with the letters "Kaaf Haa Yaa `Ayn Saad" with the wiggle of a magic stick means Karbalah and the death of Husayn and Yazid and the thirst of Husayn and his patience.
These are examples from an ocean of similar texts, so No, Nah, Noway! That you people even remotely understand the Qur'an.
And for this we had an entire book translated:
http://twelvershia.net/2013/04/05/the-fractious-schizophrenia-discussing-the-reality-of-the-crisis-between-the-shia-scholars-and-the-quran/