Yes Cuban Coffee is much stronger than American Coffee.
The Cuban Coffee is brewed much stronger than American Coffee is brewed so if you drink Cuban Coffee without any cream or sugar then it's gonna have a strong taste to it.
Cuban Coffee is made and brewed with Ordinary coffee beans just like American Coffee is and then Cuban Coffee is sweetened with some sugar.
I personally do not like any sugar in my coffee but will add some cream to my coffee.
I once tried Cuban Coffee when I was in Cuba about 10 years ago and it was strong and I couldn't stand it even with the sugar.
But my sister loved the Cuban Coffee and said it was just perfect for her.
My sister loves her coffee strong so that's a reason she loved the Cuban Coffee.