Depends on the level of gear you have, the amount of buffs currently active and the level of the target you are attacking. Against a similar level target there's minor differences, whilst against a boss (level 63) you'll gain more options in terms of gearing and in the end dps output.
Preraid bis, no buffs, no armor target, target level 63: roughly ~3-4% dps difference. I recommend downloading the RogueDPS reborn sheet which requires excel to check whatever you may come to think of at
http://www.mediafire.com/download/yfrdb ... oyoen.xlsxBest of regards
Soyoen