Greatsword:

Hundred Blades: Generally people aren't going to stand in a full Hundred Blades, and the damage is backloaded to the last hit, so it's generally a good idea to synchronize it with a downed body to cleave (so they can't move) or Frenzy (so they have less time to move).

Whirlwind Attack: This attack is a massive burst of damage. It can hit the same target up to 4 times if you do it against a wall or while Immobilized. It's also great mobility for roaming between points and positioning yourself mid-fight. Distance traveled is increased by swiftness.

Bladetrail: Does good damage, especially if it hits both going out and coming back. It's also really good for chasing targets because it cripples.

Rush: Rush can hit as hard as a killshot sometimes, but it's really buggy around terrain. It's also an amazing mobility skill for roaming between points. Distance traveled is increased by swiftness.

Arcing Slice: Generally I try to avoid using this, since it's mostly a waste of adrenaline. However, I do sometimes use it to finish someone off if it will do the last bit of damage. The fury just generally isn't needed because of Signet of Rage.

Rifle:

Aimed Shot: Great when chasing or kiting to cripple without having to switch to Greatsword.

Volley: You want to use this one on cooldown, especially if you proc the Intelligence sigil and don't think you can get off a killshot.

Brutal Shot: Eight vulnerability stacks isn't anything to laugh at, but it's still probably the least useful of all the rifle skills.

Rifle Butt: Rifle butt is really your only hope if someone closes on you and your stances are down. It does great damage. It's also really nice to knock rezzers off a downed body before you start cleaving with greatsword.

Kill Shot: This skill does absolutely insane damage, even without Burst Mastery and Air or Fire procs. It can hit up to around 16k, but tends to hit 8-9k. Use it with Intelligence as much as possible. Use Frenzy to vary the long channel time to make it harder to dodge.

Utilities:

Healing Signet: I like using Healing Signet because I'm generally in and out of fights taking some damage, but making it away with my greatsword, so the sustain helps. If you find yourself against a bursty comp, or just dying too fast in general, something like Defiant Stance or Healing Surge could be more useful.

Endure Pain: Try to time this to negate burst, possibly when they try to burst you while you channel Kill Shot, but mainly when you're standing at melee range to cleave a downed body. It synergizes well with Frenzy because it negates the 25% damage increase associated with the skill.

Berserker Stance: This is your only hope against conditions. You have ZERO condition removal, so stay away from necromancers and engineers if you don't have this up. Keep in mind, it also brings up your adrenaline, increasing your damage due to Berserker's Power and Heightened Focus, as well as allowing you to keep those Kill Shots coming.

Frenzy: This skill lets you vary Kill Shot channel times to catch even people who are prepared off guard. It also helps you land a full Hundred Blades.

Signet of Rage: This skill keeps your swiftness uptime high for increased mobility in and out of fights, as well as giving you high uptime on fury and might for increased damage. There really isn't another good option for an elite.