I see that your moveset if geared towards sheer power. So I am also guessing it is suicidal and he won't be entering twice. Because of that, I suggest Flare Blitz over Blaze Kick because Blaziken is frail as it is and you need to kill your opponent ASAP. So in all honesty, use Flare Blitz, but if you don't want the recoil (though it doesn't really matter because of his two other moves) use the latter.