In some cases, Islam gives quantity importance, for example when praying in congregation, the more present during the prayers the more reward there is in it.

In some cases, Islam also gives quality importance, for example giving towards the poor where how much given is not important, but rather the sincerity in which it was given:

{وَيُطْعِمُونَ ٱلطَّعَامَ عَلَىٰ حُبِّهِ}

and they give food, for the love of Him, to the needy, the orphan, the captive.([1])  The amount given was not much, but the sincerity was pure.

Sometimes both quality and quantity is proposed.  For example, with regards to the remembrance of Allahﷻ the Qur’an states

{يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا ٱذْكُرُوا ٱللَّـهَ ذِكْرًا كَثِيرًا}

O believers, remember God oft,([2]) and also

{هُمْ فِى صَلَاتِهِمْ خَـٰشِعُونَ}

Those are they who are humble in their prayers.([3])

[1] Insan 76:8

[2] Ahzab 33:41

[3] Al Mo’mineen 23:2