Jade
Pros: Her attacks are pretty strong. Lovely X-Ray move with a decent amount of damage. Her Overhead Staff is useful to start a lot of combos (usually I follow it up with a double Glow Kick). Her enhanced Razorang attacks are also useful for combos and her enhanced Shadow Flash is really good because even though damage is being inflicted to her, she can still attack without falling down and being stunned.
Cons: Her moves are pretty slow. (Just find the right moment to attack. Block when needed.) It's also hard to do her X-Ray move by itself because it's so slow and predictable. (What I do for that is combo it up with "Bad Girl": BP, FK, F + BP or "Assassin Strikes" : B + FK, BP then press the X-Ray buttons.)
Kitana
Pros: Her fan combos are usually fast. Her X-Ray attack is useful when in long range. Her fan toss and her square wave butt attack are my favorite moves because they are so useful too.
Cons: There are times when she is slow. Her primary outfit in MK9 is the WORST!!! So I consider her UMK3 outfit as her primary outfit instead especially when I team her up with Jade (who's primary outfit I usually use).