It depends if you are comfortable with the playstyle, Many says KDDK is generally better than KKDD although i'd say it's just a question of preference. The only problem which residues in KKDD compared to KDDK is mono-streams (they consist in streams of the same color repetitively such as KKKKKKKKKKKKKKDDDDDDDDD), in some cases they are too long and require much stamina so mostly KDDK will always win in that, but for the other things you can choose whatever playstyle you want. If you are asking because you don't see any top player using KKDD then you can find many, an example is Applers which is probably one of the strongest taiko players if not the strongest (depends on opinion) and he also uses KKDD.