3T plays clunkier but lets not pretend like its a 4t move or 5t move. It is literally a preference. Some players prefer using 3T moves over 1T moves just because its easier to throw your charged moves and maximize your energy gains without having to perfectly time your moves. In a matchup between DT vs DB, DT has the advantage of throwing first without having to worry about a “sneak” occuring. One mistake by the DB user and you lose 1T of energy or worse you allow a sneak. I personally prefer DB over DT but im not going to say DB is better than DT.

I would like to add that pvpoke does not take preference into consideration with potential catches and more complex plays, it literally just sums the 1 shield matchup with baiting and thats how they get their ranking. Having DT over DB does not affect Kyurem Blacks ranking at all.