These two Nigerian rappers are cool. How about Wizkid and Olamide - who is the richest and the most popular singer?
Both Olamide and Reminisce perform in Yoruba language. At this Reminisce also sings in English. Both singers were signed with Coded (the same recording studio). They both have made a significant input into Nigerian indigenous music.
At this, seems like these two are not competing with each other, as they keep on featuring in the videos and songs together. As to who is the best, it is up to you to decide, as we all have different preferences and tastes in everything, including music.