People focus too much on swords, anyway. Pole weapons were the primary melee weapons for most combatants, including samurai, with swords being akin to sidearms.

But there are certainly trade-offs in design. Katanas are good at chopping unarmoured opponents and being sharp. The crossguard of a longsword can and was used to bludgeon an armored opponent, who would be basically immune to cuts. So if I abducted you and forced you to pick a sword from a lineup, then fight someone to the death, you'd want to know who you were fighting and what they had, and pick based on that.