Different series it's true... although I think they share a lot in common in the themes and the intricacies of the plot between the mafiosos. I look at Tony and I see Ciro in at least one of his lives.
But they are very different in one thing... the mood of Sopranos changes frequently while Gomorra has that moody mood 99% of the time.
Let's not forget that Sopranos opened the door for something as impressive as Gomorra to be made for television. Before Sopranos Tv Shows only had the depth of Friends and so on, if Breaking Bads, The Wires and Game of Thrones exist is because there was The Sopranos.
Gomorra is incredible - beautiful cinematography, cool characters, and masterfully brutal realism. It’s quite possibly the second greatest show ever, but the first will always be The Sopranos.