Best of Creatures are those with whom Allah was pleased!

[Aba AbdAllah]

Indeed, they who have believed and done righteous deeds - those are the best of creatures.Their reward with Allah will be gardens of perpetual residence beneath which rivers flow, wherein they will abide forever, Allah being pleased with them and they with Him. That is for whoever has feared his Lord. (Surat Al-Bayyinah (The Clear Proof) verse 7- 8 )

Best of creatures are those with whom Allah was pleased, and the Holy Quran testifies that Sahaba were from the best of creatures.

And the first forerunners [in the faith] among the Muhajireen and the Ansar and those who followed them in goodness - Allah is pleased with them and they are pleased with Him, and He has prepared for them gardens beneath which rivers flow, wherein they will abide forever. That is the great attainment. (Surat At-Tawbah verse 100)

Certainly was Allah pleased with the believers when they pledged allegiance to you, [O Muhammad], under the tree, and He knew what was in their hearts, so He sent down tranquillity upon them and rewarded them with an imminent conquest.(Surat Al-Fatĥ verse 18)