Let's settle this. Since GameFreak was idiotic enough to make two new mons so similar to each other, we have to figure out which is the better of them.

Dhelmise
>Higher attack
>Better physical bulk
>Rapid Spin is superior to Defog
>Nothing is immune to Anchor Shot
>Power Whip is good STAB
>Earthquake, Brick Break, Gyro Ball, and Rock Slide for coverage

Decidueye
>Faster
>Better special bulk
>Spirit Shackle has better offensive coverage
>Brave Bird, Low Sweep, Sucker Punch, and U-turn for coverage
>Baton Pass along with Swords Dance and Nasty Plot

I will never understand why these two share typing, general stat spread, and even retyped signature fucking moves. Even if Decidueye had a special movepool or swapped Sp.Attack for Speed we wouldn't be having this conversation.