Which is better

Which is better bishop or knight?

Depends on the position, but usually bishops.  

Depends whether you are a tactical nerd or a positional fanboy.

Bishop

I like a knight because of his shining armor.... !

knight by FAR

Great question! The conflict between church and state was a constant theme throughout medieval history. While bishops were the ones that delivered the Church's message, knights made up the elite fighting force for Kings. It is hard to say which had more power - bishops probably had more influence, but knights had sheer military power on their side.

Knights are very polite and have the best etiquette, protect the weak and promised to be rightful. Bishops are devoted to God and the spiritual world and sustain the church.

I vote for bishops, because I'm a painter and they were patrons of the renaissance.