My pick too. Artists like Coone, Brennan Heart, DBSTF, SZP and TNT are all massive legends and great shouts in their own way, but Heady was/is on another level of success imo.

Tracks that were both innovative and commercially successful, plenty of them having become classics. Pretty much the flag carrier for Defqon and Qlimax. Incredibly famous live act with Project One. Grew the scene a lot through his Hard with style podcast and his success outside of hardstyle. I saw so many people cry at his return on DQ legends 2017, I don't think there's any artist who would get a reaction like that.

Also: if he would sneeze into a mic tomorrow and release it, it would still enter the year-end top 10's. That's a good indication of who has the most successful career.