The rogue dueling is kind of an art, the duel itself has alot to do with spec and gear, but mostly skill. I would agree that agility is best for rogues and slap on your eludings and stealth cloak if you still have em. I personally like ap because i can take down a rogue within the time that they realize that he is dead. The duel can be determined by the spec, it the two people are skilled enough. 0/3/7 or full sub the great duel spec. (i prefer the 6 sec gouge over full sub)
The combat of the duel is using moonwalks (mouse + s and a strafe key) to garrote kite and try to restealth or keep him in combat with thrown. So if you are specced right with an imp stealth cloak and a sap macro, you have a great shot at getting the opener everytime. I use garrote glyph and get about 400-500 damage from the bleed, vs a decent agi rogue he has around 1200-1600. This brings him down alot and you can bleed kite to get him down 400 without him touching you and restealth.
Vs a good rogue he wont let you restealth, but if you cant bleed kite this is where the duel actually happens. Using your mouse you want to never expose your back to your opponent. Dont gouge all of the time. Start using it at about half health to restealth or bandage because it will be dodged alot. But you dont want to use it all of the time because it reduces them gouge timer every time you use it.
If your opponent is trying to get away from you have to time your thrown wepon right. The best time to throw is right when you are about to get out of combat, he will stealth and then get knocked out of it by the thrown. (takes some practice but is easily learnable)
Timing bandaids is difficult because its better to try and los and restealth + sap then bandaid, but if you are 20% or lower go for the gouge bandaid if his trinket is down.
This is kinda wordy and i cant review this atm because im in class, if you have any questions ill happily answer.