Argument
Allamah Sa'duddin Taftazani, reasoning with the divine statement…
"Ye are the best community that hath been raised up for mankind," (III:110)
…states that this ummah's being better than all
other ummahs is due to the Holy Prophet's 
perfection in religion, and the excellence of this ummah is subject to
its prophet's excellence, whom the ummah follows and conforms to. So, had
he not been (God forbid!) superior to all other prophets, then his ummah
too would not have been the best of all the communities. And this verse
of the Holy Quran is clearly showing that this ummah is superior to all
other ummahs, and hence the Prophet ,
who is of this ummah too, is superior to all other prophets, because correlation
between these two is quite evident. In short, he is superior too and greater
than all the eminent prophets in each quality of perfection.
It is for this reason that while Allah Most Glorious
has addressed other great prophets with their names, He has not addressed
our Lord and Master, the Holy Prophet
by his name; he has rather been addressed with any one of his high qualities
like ‘Ya Ayyahun-Nabio’ (O Prophet), ‘Ya ayyahur-Rasulo’
(O messenger), 'Ya ayyhul- Muzzammilo’ (O the Enshrouded One), ‘Ya
ayyhaul-Mudath-thiro’ (O the Cloaked One), etc.
Imam Razi's Argument
As Regards the Prophet's
Superiority
As regards his superiority over all other great prophets, Imam Razi, arguing on the basis of the divine statement:
"Such is the guidance of Allah wherewith He guideth
whom He will of His bondmen" (VI: 89), states that Allah Most High endowed
all the great prophets and messengers with praiseworthy qualities which
were individually in them, but when he ordered the Holy Prophet
to lead all of them, all the individual qualities they had been endowed
with, were collected in the Holy Prophet's
auspicious person; and thus he became superior to all other prophets.
'What the other beauties possess totally, you possess them alone."
