Armor and Weapon Stats
Any mix of assassin/berserker including full assassin or bersker is optimal. The difference between the two is less than 1% total dps, dependent far more on things such as whether you can reflect stuff in the encounter, or if you can keep your phantasms up.
If my memory serves me right, full Assassins set will (*probably) give 1% more dps if you have 25 stacks of might on you (which, lets face it, is highly unlikely you will achieve during most of the fights).
Here, check this topic: https://forum-en.gw2archive.eu/forum/professions/mesmer/Analysis-Berserker-vs-Assassins
*note: might was nerfed to give less power per stack, thus this comparison above might be invalid
Like Fay said, any mix of Assassin/berserker is just fine.
Mesmer only exists in pve for reflection. Reflected damage is not based on your power, yet on your crit change and crit dmg. So kitten > zerk.
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