There is no "keen" property in Baldur's Gate. Also, all weapons of the same type (Longsword, Short Sword, Katana, etc) have the same base damage, so the examples would be:
-1d8+Fire
-1d8+Law
-1d8+2 VS Orcs
Don't tell me that's a hard choice, the fire wins by a mile. Sell the rest. Usually the choices are even more obvious than that, such as:
- Celestial Fury: Redicilously high damage, stun with no save, proc for even more damage. Counts as +3.
- Katana +2. No extra stuff.
Or even better:
- The Holy Avenger, Carsomyr +5: Overpowered in every possible way due to 50% magic resistance and dispel on hit (in addition to a bunch of extra stuff). Counts as +5 (+6 after Cespenar upgrades it).
- Every other sword in the game: Can't hold a candle to The Sword of Uber Overpoweredness.
After you get Carsomyr, usually in act 3 (act 5 if you can't kill Firkraag untill that point), there's no need to ever replace it with any other weapon in the game. Period.
-1d8+Fire
-1d8+Law
-1d8+2 VS Orcs
Don't tell me that's a hard choice, the fire wins by a mile. Sell the rest. Usually the choices are even more obvious than that, such as:
- Celestial Fury: Redicilously high damage, stun with no save, proc for even more damage. Counts as +3.
- Katana +2. No extra stuff.
Or even better:
- The Holy Avenger, Carsomyr +5: Overpowered in every possible way due to 50% magic resistance and dispel on hit (in addition to a bunch of extra stuff). Counts as +5 (+6 after Cespenar upgrades it).
- Every other sword in the game: Can't hold a candle to The Sword of Uber Overpoweredness.
After you get Carsomyr, usually in act 3 (act 5 if you can't kill Firkraag untill that point), there's no need to ever replace it with any other weapon in the game. Period.