To put it short,
DB-DA-DA combo is more of a burst damage because it's has less hits than MD. So, it's either big damage from crits or normal damage.
MD has more hits. It has a greater chance for crits than the said combo, so more damage on average.
DB-DA-DA combo is more versatile since you can use another skill in the middle if you have to. Combo Mastery can proc and you deal even more damage than MD during the 3 secs. 60% + 60%+ 60%= 180%, compared to MD's 110%.
MD is a finisher. 110% will go through and is a safer bet than a single crit DB, since getting hitting a critical is up to chance and you can miss that one shot.
lol, this is boring math talk. >.> Yeah, they are both very similar. 110% in damage, but have different usages. You want DPS for PvE? DB-DA-DA is good. MD is good when used in hide for PvE, but it's very effective against sliding bodies.
Edited by ZT0100, 19 August 2013 - 03:03 PM.