Which entei is better Inuyasha entei or Pokemon entei?

" Better " is hard to determine . It's more of an opinion.

The Inuyasha Entei is a horse type demon, Rather like Ponyta, or Rapidash. The Pokemon Entei is a Volcanic Dog type Pokemon. So i comes down to whether you like dogs or horses.

Now the attacks are different. The Pokemon Entei can use a lot of powerful fire type attacks and it is also referred to as one of the 20 or so Legendary pokemon. The Inuyasha Entei has other abilities such as being able to emit large amount of demonic energy out of its mouth ( Making it possible for Inuyasha to kill it using the backlash wave ) and it also has the ability to move at extreme speeds.

As stated earlier it's truly your choice on what you like better.