Tata's inability to change things around makes him an inferior coach to lucho, who is more pragmatic than our previous coaches. Tata's barca style was lethargic and had tactics that involves having static possession and asking messi to find a solution. But we also need to consider that lucho had suarez and rakitic who made barca better and are better fit for the team than alexis and cesc. Still it was not easy to make everything work and lucho had the balls to experiment stuff and find the right mix. Tata never tried to do, he just followed what tito's barca did.
I don't know who is better tactically, if we consider tata's previous stints i am more inclined to say tata is a better coach tactically. But i know i would take lucho over tata any day, we don't need managers who play it safe. Each manager should bring their own style and ideas to the team, that is when the team performs at it's best.