>>63836121 (OP)Yeah.
I have sword tism and have spent about 20 years playing with swords from various systems (HEMA, Koryu and Kung fu.) I've sparred with all of them at a medium level and a few high intensity battles where you can get your hands broken / get knocked out.
The Katana is a forward balanced, heavy cutting sword. For that, it does great and will severely wreck you. It's point is also strong and makes it good for shoving through chainmail and clothing.
The Longsword (if we consider a sterotypical one) is much more flexible with what it can accomplish. Two edges doubles the kinds of cuts it can do. Like if you think of an X and + directions, a Katana can do them but the LS can reverse cut along the same lines without needing to turn the edge.
The Longsword also unlike a Katana generally has a wide guard that allows dicking around in the bind/redirecting blades and protects the hands a lot more than the oval or circular guard of the katana.
Verdict: Both are tried and tested swords of war that can take off arms, heads or legs. Both can thrust armor. The longsword is just a bit more versatile and useful as an everything weapon. Katana has some advantages in specific scenarios due to it's shape (cutting from the draw from sitting or kneeling etc.) but that's about it.