I try to keep both my piercing weapons and slashing weapons skills maxed. As for what you should use? it really depends on the best weapons available to you. In short I look for a low delay 1.5 or less, a good proc, dmg ratio, and stats. And once in the 40's you will use PGT for the proc soloing, SSOY, and SBD until you get an amazing raid mob drop. Right now my Swash has been using from level 33-36 a PGT awesome for the proc, a good delay at 1.2, decent dmg ratio I believe 18.6 not sure, and good stats my other weapon is a Sundered Spatha of Confusion good delay 1.2, awesome dmg ratio 20. something, and amazing stats. The spatha is very rare however and one of the imbued weapons with a good proc could easily replace it.