I'll make this a new post just in case, I pulled this data from torhead, I don't necessarily trust their numbers so I haven't posted the listed value for Dark Charge and we don't really know exactly how much shield you're getting from force scream. Some of the talent choices might not be particularly useful (e.g. parasitism) and in a real build would probably be swapped out for greater utility or threat generation.
Juggernaught
Damage Reduction:
+60% Armor
+6% defense
+6% defense from retaliation (not always up)
+19% shield chance
+6% damage reduction
+4% Elemental/Internal damage reduction
Moderate damage shield from casting force scream
Cooldowns (greater than 1m):
Endure Pain - +30% Health for 10 seconds, 90s cooldown
Blade Turning - 12 seconds of 25% less damage from force and tech, 2 seconds of +100% Defense followed by 10 seconds of +50% defense, 180s cooldown
Invincible - 40% damage reduction for 10 seconds, 120s cooldown
Unleash - Heals self for 10% of total health, CC breaker, 90s cooldown
Debuff:
-5% enemy accuracy for 18s, pbaoe, 15s cooldown
Powertech
Damage Reduction:
+76% armor
+9% damage reduction
+27% shield chance
+6% shield absorption
+3% endurance
Cooldowns:
Energy Shield - 25% less damage taken for 12 seconds, 120s cooldown
Kolto Overload - 15% health restored over 10 seconds, 120s cooldown
Oil Slick - 20% reduced accuracy for 18s, pbaoe, 60s cooldown
Debuffs:
-4% enemy damage for 15s, either single target or pbaoe
Assassin (note the greater armor increase here is obv due to the use of light armor)
Damage Reduction:
+170% Armor
+15% shield chance
+2% damage reduction
+9% internal/elemental damage reduction
+4% defense
+3% endurance
+base endurance based on Assassin's Training (not sure what the max rank is)
Dark Ward - +15% shield chance for 8 charges over 20s, 12s cooldown
Cooldowns:
Deflection - +50% defense for 12s, 120s cooldown
Force Shroud - Removes all hostile effects, increase force and tech resistance by 100% for 5 seconds, 45s cooldown
Overcharge Saber - 10% self heal on cast, lowers rate limit of Dark Charge to 3s, 120s cooldown
Self-Healing:
Dark Charge - 65% Chance on attacks to heal for x health, cannot occur more than once every 4.5s
Harnessed Darkness - Casting Shock adds a stack of Harnessed Darkness, at 3 stacks force lightning is uninterruptible heals for 3% health per tick
Parasitism - Critical hits from periodic damage restore 1% health
Debuff:
-5% damage for 15s, aoe, 7.5s cooldown
-5% accuracy for 18s, 15s cooldown
And that's it. It seems to me that the Juggernaught has the superior cooldowns bar none, the cooldown on the cooldowns doesn't seem to be any different from that of the Powertech. Without considering cooldowns the Jugg comes out at +12% defense, -3% damage reduction from kinetic/energy, +1% damage reduction from internal/elemental, -8% shield chance, -6% absorption and -16% armor but with a damage shield of unknown scaling and value.
