I agree that it depends on the situation and what you are up against. A scimitar is a hacking and slashing kind of sword, it does have speed on it's side however. A longsword can be used for hacking, slashing AND piercing/stabbing. I personally own a replica longsword (for lack of a better description) and it weighs about 8 pounds and I can easily handle it in one hand (but I do practise my swordplay from time to time). Then theres that fact that these weapons may be of different alloys. I myself would choose the longsword.
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