`what animes can i watch that are like death note or one outs?

Code Geass is an amazing anime that is similar to Death Note. It's got that same chessmaster genius mastermind thing going on except now there is a massive amount of action involved and tons more characters. It's very well-developed and written and also has an amazing ending unlike Death Note and I'm sure you'll like it. Kind of surprised you didn't know about it considering it's the go to anime after Death Note. It excels in that sort of antihero who's too smart for his own good type story. The only anime that rival it are Death Note, Akame Ga Kill, and Attack on Titan in my book in terms of how good it was. Seriously dude watch this and I guarentee that you will not be dissapointed my friend.

Tokyo Ghoul

Attack on Titan

Psycho Pass

Full Metal Alchemist

Ghost in the Shell (it's older and a bit different tho)

I too am a very big fan :)