After the battle, there was no need to prove which of the two potions was superior.
The Berserk Blood Potion only brought ten seconds of Berserk, and under the Berserk effect, an ordinary Swordsman could withstand a Great Swordsman. But the Dragon Strength Potion brought at least a full ten minutes of physical enhancement. That enhancement could let a 5th Rank Mage have the same physical strength as an 8th Rank Swordsman.
And that was the effectiveness when used on a Mage!
The physical strength of a swordsman was on a completely different level when compared to that of a mage, especially when the swordsman was someone like Bill, who was as strong as an ox. Mages could be considered very delicate, yet even a delicate mage was able to be evenly matched with a strong swordsman.