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i have read that mutilate relys more on agility than attack power so is moongoose better than zerking?
Mongoose is no comparison to Berserking.
Mongoose gives you 120 AGI which for Rogue translates to roughly 1.4% crit (if I recall) and only 120AP.
Berserking gives you a straight 400AP. The negative armor is moot for a class that has an abysmal armor rating in the first place (even a plate-wearer for that matter).
It's true that some specs do better with AGI than AP depending upon the gear set up, but that's when you have a comparable amount of AGI and AP. If the amount of AGI and the amount of AP are in the same ballpark I would take the Agility, but the vast difference between Berserking and Mongoose makes it no contest. Berserking will always win.
The price of Abyss crystals has also crashed (at least on my server) so there's no real reason to avoid getting it these days either unless it's a weapon you plan on replacing soon.