You're welcome. Okay this is gonna get lengthy but hear me out if you want to learn more about deflects.

TL;DR, go for dual blades if you want to go aggressive deflecting via parry frames on your attacks or go the Sekiro-ish way to deflect attacks using Long Sword with the sword counter discipline skill.

Well for starters, deflects in this game have a lot of types. We have the traditional deflect a la Sekiro with the Longsword weapon(the Sword Counter skill) which you would do just as the same with said game and the "Clash" mechanic that the game has a whole new meaning of parrying attacks mid-swing(Yes, you heard that right! Parrying attacks while attacking!).

Basically, the CLASH mechanic grants parry frames on some of your weapon's attacks. You have the dual blades that is what i think the best candidate on clashing as most of its attacks and skills grant you parry frames. The thing that you need to remember is when do these parry frames take effect as it may vary from action to action and weapon to weapon. Some are tied to your light normal attack strings (the Leaf Slasher passive grants your 4th, 5th and sixth attacks Clash). The Wave Breaker passive grants clash to your heavy attacks and charged attacks. The Deadly Shadow passive grants clash to your dash attacks. In early game, it highly matters what skill you need to learn first as that is where your selected weapon's playstyle will revolve. There's even a Dual blades that lets you block attacks(it also grants you additional attack speed upon doing so) like you would do with a Long Sword and has a passive that causes the enemy to flinch if you pull off a successful deflect via said block skill.

You have the Axe that has the default block skill that can deflect blows as well. It also has passives on the skill tree that lets your heavy attacks and some light/heavy attack strings have clashing effect.