Yeah they're a bit better at slashing whilst a straight sword is slightly better at thrusting. Typically a curved sword is a bit better whilst on horseback or whilst fighting unarmoured or lightly armoured opponents and straight blades are a bit better whilst fighting one-on-one and against somewhat more armoured opponents.

But these are slight differences and sword styles are also varied in each region, so the Japanese did develop swords which were more adapted to thrusting with reinforced tips and Europeans did develop swords which were more effective at slashing.

I think some people obsess over what swords are the best and the worst. In reality the style of sword was unlikely to be the major deciding factor in a one on one fight. The amount and quality of armour and the skill and capacity (Size and strength) of the fighters themselves are much bigger factors.