Kyoukaisenjou no Horizon, Sword Art Online Recommendations
Both series are based off of light novels. Though the main similarities is how they were adapted into their anime. Both barely bother to explain to you the minor details and you'll find yourself confused throughout both series unless you have prior knowledge of them from the light novels or any other source, although SAO does explain 'some' of its terminology. But regardless of understanding, both series are still enjoyable even with the lack of understanding. The overall genre of the two are fairly the same as well, as in action, adventure, fantasy, romance.