Top Ten Dark Souls 3 Weapons

Pros:
Double the damage against hollows, which is like 95% of the enemies in the game.
Good damage
Heavy attack is a thrust which is useful against larger foes.
Relatively fast attacks.

Not very heavy(for a greatsword)

Cons:

Uses a lot of stamina

The bosses are hard to overcome and defeat, but this weapon makes it easier.

The best weapon, light,strong and durable and obtained fairly early

Pros:
Very fast attack speeds
Very hard to parry skill.
Deals bleed damage.
Good physical damage.

Cons:
Not very durable

Pros:
Good reach
Lightweight
You gain 30HP every time you kill an enemy with this weapon.
Skill pierces many shields.

Does poison damage.

Cons:
Easily parried

Pros:
Decent Damage
One of the best skills in the game. The skill is a gamble of either AoE effect that knocks down your enemies, an effect similar to Perseverance, or creates a floating sphere that follows you until it stops to explode dealing a decent amount of dark damage. Warning the explosion of the floating sphere can damage you so make sure you're out of its blast range, or dodge good.
Good Poise Breaker
Does dark damage

Cons:
High stamina consumption
Heavy
Easily parried

Pros:
Great Damage
The wind wheel skill doesn't cost any FP, unless you perform a light or heavy attack.
Good Poise Breaker

Cons:
Uses a lot of stamina
Heavy
Sweet Spot(Spot on the weapon where it does more damage) (It may say greatword, but it's actually a unique halberd).
Semi-high strength stat requirements.

Pros:
Lightweight
Fast attack speed(Best used if you infuse it with bleed or sharp)

Cons:
Not very durable.
Can be parried easily.

Pros:
Good physical damage
Good Lightning damage
Skill does a lot of damage to enemies right in front of you.
Decent reach.

Cons:
Heavy
Slowish two handed attacks
High strength stat requirements

Pros:
Very fast attacks
Can have another shield with the weapon. This good if you want to put a shield that has perks to it on your back while you two hand the valorheart. EX: Grass Crest Shield.

Cons:
Cannot be buffed or infused
Uses a lot of stamina. It may be fast, but it is still a straight sword not a dagger.

Pros:
Fast.
Deals bleed and dark damage.
Skill allows for very fast slashes(Light attack) and ranged dark shockwave(heavy attack)
Semi-good reach.

Cons:
Very low durability.
Demanding Dexterity stat requirements.
Physical damage is on the weak side

The old wolf curved sword is a hard weapon to get into. Not only do you have to get 10 sword grass, but this weapon has low range, speed and hardly enough poise to trade. Despite this, the old wolf has some insane damage (when pared with the right eye ring) Don't forget about the weapon art, which can't be parried and puts you at a safe distance from your enemy.
All and all this weapon is my favourite.