Total noob here but I actually took the time to listen to all of these entries for several times and I still can't decide whos the best, it's insanely difficult. Will sounds like a professional, the producing quality is great, and the voice is totally on point. Thievley and Renril both can't match that quality but Renril sings at an enormous speed, must be such a difficult song to cover (would love that song as a beatmap btw.) and Thievley gets props from me just for picking an English song, that's brave. Not to mention the great voice, of course.
It's a pain in the ass, someone help me?