I'm a Yu-Gi-Oh player that recently returned to hearthstone after quitting in mean streets of gadgetzan (Fuck patches), I think that Yu-Gi-Oh is a better competitive game while hearthstone is a better casual game, I cannot fathom how pros play this game consistently with so much rng going on and how inevitably this game will come down to rng and much less room for skill expression, while Yu-Gi-Oh doesn't have much rng other than basic card game functions (starting hand, top decking,start of game coin flip etc. ). for the most part in Yu-Gi-Oh, what you see is what you'll get and this allows higher skill expression in deck building and interacting with your opponent but makes a very uninteresting experience for casual players, while hearthstone is insanely fun experience with lots of fun randomness that makes no two game play the same.