The smaller of the two grants close to normal movement speed with faster attacks, while the massive weapon is much slower but deals huge amounts of damage. (gamecrate.com)
By this I mean, bosses are very fast moving and have a variety of fast attacks that require one to pay close attention. (monstervine.com)
With this setup Ozil will have the lightning fast attacking front that he loves to have. (justarsenal.com)