Rank 1: Body Count
Regain health and stamina with every minion kill. This Feat gives you a way to regenerate health without having to run to a captured Point, which depending on the battle you might not have access to. The Stamina regen will let you jump into the middle of the pack of enemy minions and hold your area attack almost indefinitely as they walk like lemmings into your sweeping flail.

The other options here are Revive Speed and Fiat Lux. Revive Speed is nice, and my second choice if I know I won't be anywhere near the Front in a given match. Fiat Lux is a devastating ability, but I personally do not enjoy using it because I think it's a stupidly powerful Feat that is unfun to use or be hit by, and I dump Feat Cooldown in my gear choice.

Rank 2: Shield Basher
Deal damage with every shield attack. This will see so much use it's pretty much mandatory. The only downside is that sometimes you will kill an opponent with this and not be able to Execute, which means they can be revived.

Conqueror the Feat is useful in very niche situations where you need the 100 point swing and enemies are coming to stop you, this can make the difference. The active Feat option, I forget what it's called, boosts your defense at the cost of movement speed. It's not a bad trade off since you're too slow as a Conqueror to chase people down regardless, but it's still nowhere near as good as Shield Basher and again I don't pick actives because of gear.

Rank 3: Punch Through
Deal damage through blocks. It's a toss up for me here between Punch Through and Block Heal. I barely notice either one, but I have secured some kills with blocked Light Attacks.

Pugno Mortis is active, and thus I don't use it. Could be good, I don't know, but I prefer to kill my foes with my flail and shield.

Rank 4: Regeneration
When out of combat, regenerate health. Similar to Body Count, this Feat can save your life if the enemy team has taken both Control Points. It kicks in very quickly after leaving combat, so if you're in trouble you can run away and be healed up in a pretty short time. It also stays active while on a Capture Point, so you heal up very quickly then.

The other options are Catapult and Indomitable (or whatever they're called). I don't always reach the top tier Feats because Conquerors have a hard time scoring Renown, so Catapult will probably only get used once in a match. It's got a really long wind up, so any foe that isn't blind or trapped already will get away. Indomitable gives you Super Armor, meaning your attacks won't be interrupted. This has gotten me killed a few times because I get overaggressive. I'm sure there are other players who get great mileage out of this, but for me and my low CD gear, it's a pass.