EV, Lucho and Koeman are similar tactically (average imo), with Koeman being slightly worse than both. Lucho is the best of the group when it comes to personality and managing the locker room. EV was way too submissive and passive, a "good guy" type who bent for the veterans for an easier ride, Koeman is tough and demanding, but also moody, grumpy, and chaotic, which gets him in trouble.
Lucho hit a much better balance between being firm and being fair, as well as pretty likable as a person. Don't remember him having random idiotic feuds with players. He gave almost everyone who was at least competent a fair shake.
Also, Lucho was the only one who benched Amigos when they put in dire performances, I remember Alba and Pique rubbing the bench while fit, in important games. And that is 4-5 years ago when they didn't suck as much.