get the steel LG by attack hill giants or buying it.
The best longsword, according to the runescape wikia, is the chaotic longsword. The chaotic longsword is obtained via the dungeoneering activity. It costs 200,000 tokens and if completely uncharged will cost 2 million coins or 200,000 coins and 20,000 tokens to recharge to 100%.
Longsword.
probably chaotic maul or vestas longsword
Rune Short-sword on Accurate, or Rune Longsword on Stab/Controlled. They're about equal in Attack. Rune Longsword will hit higher.
A steel shortsword because they both do the same damage but a steel shortsword is swung faster.
Well The Long Sword has better statistics but if your about speed the scmictars better.
Chaotic Longsword > Saradomin Sword > Brackish blade/Dragon Scimitar > Rune Scimitar
This is against the rules.
Different weapons are better against different monsters, since there are different attack types and different types of defenses, so there is no single "best" weapon. For an all-purpose weapon, many players prefer either the longsword, or the scimitar.
Steel Titan, by far.
5-7 days, depending how fast you can do the floors and your current dunge level.
You can buy a rune longsword at the grand exchange.