I will try explain. All Types of Daggers:
1. Has no sufficient CC. It has ability "Infiltration", which should, quote: "stuns any enemy target in the area". What we really have? No stun - only non-targeted sleep (if you lucky guy). As we know, sleep will be disturbed by any incoming damage. This quite useless in mass pvp fight. There is should be better REAL STUN, atleast for one target (and, of course, blink).
2. "Sunder Armor" ability does almost nothing for additional damage without huge number of Albion Online Silver. I mean, debuff Armor and Magic Resistance for -14 at T4.1 and -18 at T8.5 is useless. We have tested it.
About Daggers Pair.
3. "Slit Throat" seems to be nice damage skill. But let's compare the Daggers Pair and Cursed Staff.
3.1. Passive skills: Daggers Pair have +10% to auto-attack damage - useless for "Slit Throat" skill based weapon because of Daggers Pair has no poison like one-handed Dagger. And additional generating energy. Cursed Staff is one-handed weapon, so it can be used with any off-hand equipment, which can give one of next passives: Increase cast speed by 10%, Reduce all cooldowns by 10%, Reduce by 30% CC (shield). Should I comment this? Cursed Staff wins this.
3.2. Cursed Staff's third ability almost same as Dagger's Pair. But Cursed Staff use it from distance. IMO Cursed Staff wins this.
3.3. Let's talk about first ability. Player who plays with daggers should rush in the enemies and only from melee distance use skills. At this time he can be stunned, knocked, sleeped, silenced. Any of this CC effects equal of death. Because of Immunity from CC won't save player from knock-back effect (and maybe many another). It will only reduce length of fly. Cursed Staff's first ability has DOT effect, which prevents casting enemy. Daggers cannot do this. Any range DD player can use knock-back from equipment and, while you in air, start using channeling ability. At this time you CANNOT even hide by invisibility - any DOT or channel ability immediately show you. And you will die. Cleanse will not clear your DOT's. So, Cursed Staff again wins.
4. Also light heavy helmet gives you additional magical damage up to +50% (and more?) and decrease moving speed. Moving speed for mages? They standing whole casting time! Again, mages win free Albion Online Gold. You wanna say about "Berserk"? Okay, +37% physical damage and decrease from -40 to -50 armor resitance. So you decided decrease moving speed for ranged players and decrease armor for melee players? Not a wise, strongly in my opinion.
About Claws: I will say shortly. Rooted enemy can use any ability. And it will interrupt this channel ability. Useless.