Over the years, even I. T20 leagues, I've seen most of the times a team that's more lethal with their bowling attack went on to win the title than a team that's been a batting powerhouse.

You can take for example RCB which always had a powerful batting but never won the title. On the other hand there's Perth Scorchers in Big Bash who keeps on surprising everyone by defending lower than the lowest targets and won Big Bash more than others because of their bowling.