I like anything with a good and well done melody that is not eclipsed by lyrics. What I really enjoy is the use of certain instruments like violin, piano, synth and electric guitar.
If I had to name one and my favourite artist I would say Waterflame. You might know him from Geometry Dash but truth is he actually has tons of other music with different genres ranging from mixing classical and electronic instruments to industrial styles. He tries experimental music and performs it really well, while still having his own style, something that once you have heard enough songs allows you to recognize any song from him, and I absolutely love that. It's the type of music that the more you listen to it, the more you like it even if at first is different from anything else.
Ofc I also like other artists like NoteBlock, RetroSpecter, GlitchXCity, that make awesome remixes of games, some of which I never played but I still love their bangers.
And then there's Xenoblade Chronicles OST, which doesn't need any remixing, as it's just perfect, emotion is magnified x100 if you played the games or watched the cutscenes.