what feats should i get

i have a level ten taxbaxin (the cat people) rogue assassin and my dm said i can have any three feats i was wondering what i should get  

Defensive Duelist allows a reaction that lets you ad your proficency bonus to your AC if you are hit with a melee weapon till your next round as long as you are holding a finese weapon. Basically a Dexterity characters version of a shield spell every round and it grows as you level.

I personally would pick Piercer to reroll damage, Speedy for hit-and-run tactics, and either Sharpshooter, if you are using a bow, or Sentinel, to get an attack and possibly extra sneak attack as enemies approach you.

DO NOT TAKE DEFENSIVE DUELIST. YOU HAVE UNCANNY DODGE, WHICH IS MORE RELIABLE AND HAS THE SAME COST. I REPEAT, DO NOT TAKE DEFENSIVE DUELIST.

Quote from EdgohSaile >>

I personally would pick Piercer to reroll damage, Speedy for hit-and-run tactics, and either Sharpshooter, if you are using a bow, or Sentinel, to get an attack and possibly extra sneak attack as enemies approach you.

DO NOT TAKE DEFENSIVE DUELIST. YOU HAVE UNCANNY DODGE, WHICH IS MORE RELIABLE AND HAS THE SAME COST. I REPEAT, DO NOT TAKE DEFENSIVE DUELIST.

 I disagree. Uncanny Dodge halves the damage you take from a hit. Defensive Duelist can negate a hit altogether, plus it continues to work until you start your next turn, so it may negate more than one hit in a round.

My top Rogue Feats in no particular order:

Defensive Duelist - Add your proficiency bonus to your AC as a reaction

Mage Slayer - Basically Legendary Resistance the feat

Fairy Trickster - Impose disadvantage on the enemies saving throws for a round; a great way to help your other party members if they have some good control options

Skulker - 10 foot Blindsight, don't reveal yourself if you are hidden and miss a ranged attack

Sentinel/Zhentarim Tactics (Melee) - Help you get attacks as a reaction, either when you (Zhentarim Tactics) or your friends (Sentinel) are hit by an attack.

Sharpshooter (Ranged) - Ignore half and three-quarter cover for ranged attacks

Speedy (Melee) - Increased move speed, Opportunity Attacks have disadvantage against you. As a Tabaxi you could combine it with Feline Agility and Cunning Action to move up to 240 feet in a turn (Feline Agility + Dash + Cunning Action Dash)

Charger (Melee) - A bit of a niche choice, but the pushback when you hit an enemy after moving up to them keeps you from needing to use your Bonus Action to Disengage, letting you use it to Dash instead and cover more ground; works pretty well for a hit-and-run melee style

Greetings Titan_of_the_gods,

As you didn't state which version you are currently playing, I linked both.

RPGBOT Assassin Rogue Guide 5e

RPGBOT Assassin Rogue Guide 5.5e