Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "I have listened to the reciters and found them close to one another, so recite as you have been taught, and beware of affectation and disputing, for this difference is just like one of you saying 'halumma' and 'ta'al' (both mean the same thing: come)."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8648