Both are isane but Eusebio is better on the ball for dribbling. You don't need to do skillmoves with him to get past deffenders. Yet Cruyff is way more usefull when it comes to shooting and passing due to his curve. this gives him the ability to place the ball way better where you want it. so in my conclusion Cruyff would be better if you're no skiller and Eusebio incase you want some one to skill and/or send deep
I myself have used both Eusebio's and currently have 91 Cruyff and Mbappe as strikers. it completly depends on what you are looking for. Cruyff is a playmaker and puts others for the goal and when he gets there he scores easy. but if you want a striker to send deep en destroy defenses with by just running you should use Mbappe.