Zidane.
Not the best tactician out there but most certainly an authoritative persona that emits respect and therefore able to create a positive aura in and around the club. The much desired positive atmosphere and the feeling that things will work out well that all three managers in the post-Ferguson era have failed miserably to create.
I also believe that both Pogba and Martial will benefit not only from having a fellow Frenchman but a legend like Zidane in particular at the helm. He likes players who are good with the ball at their feet and can make things happen and, arguably, we don't have more talented players on the ball than these two. Which brings me to the next argument: Zidane's approach at RM was mostly about control through passing, attacking players who can create when in possession and overlapping FBs. We only lack the latter in order, not to reach Real Madrid's level, but to get things going and start enjoying watching our team again. From there we can work our way upward.
I have nothing against Jardim. On the contrary, i consider him to be a very good manager and i won't even mention his lack of experience at the highest level or the time he'll probably need to adjust to the PL as negatives because, at this point, we don't have the luxury to be so picky. It's just that, IMO, he and Poch (who's a favourite on here among the PL managers) base the foundations of their respected philosophies on aggressiveness, dynamism and endless sprints. Now, if you put them in charge of a squad whose work rate is among the worst in the league and the statistics for second balls/duels/tackles won don't do it any favours either, i don't know how many things they'll be able to change and how much time they'll need to do it. Especially if Woodward wants his marquee signings and vetoes other players.
Anyway, Zidane looks to me like the one who can emulate, to a certain degree, what Ferguson did. Establish himself as the boss in the dressing room by keeping things relatively tactically simple while also allowing the more gifted players to flourish.