If caffeine does it for you and need lots of it, eating just caffeine is probably safer than drinking a lot of coffee. Coffee beans have a lot of of other stuff and it varies from bean to bean and eating a lot of some of that stuff may not be good for your gut/brain/whatever.

If you are "addicted" to coffee sometimes you will crave it if you do just caffeine, but this goes away after a while.

Be aware also that if you want the antioxidants and other stuff in coffee beans eating just caffeine won't give you that.

There’s really no evidence that antioxidants are categorically good for you. Studies have found that some benefits of exercise are mediated through oxidative stress, and get impaired by antioxidant intake.

Just coffee. You may have a MAOA VNTR that predisposes you to like coffee.