Saber

Saber or Knight of the Sword or even Heroic Spirit of the Sword, is one of the Three Knight Classes among the seven standard Servant classes summoned for the Holy Grail War. Servants placed within this class are agile and powerful melee warriors adept at swordsmanship, boasting high ratings in all categories, and they are often heroes from the Age of Gods when magecraft was still commonplace. The qualifying conditions require the Heroic Spirits to have legends as knights of the sword, and it is the class that requires the highest levels of attributes in all but the Magic attribute. Compatible Heroic Spirits usually excel in delivering powerful burst attacks, and the Class Skills are Magic Resistance and Riding.

The standard opinion is that the Saber Class is the best of the seven classes and the strongest of the Servants