Honestly, I don't think tactics are that important, much less important than the players at your disposal. If you have a fit, highly-rated XI, you'll probably win games so long as you don't do anything stupid tactically (e.g. play your striker at left back, play 3-3-4, never rotate so your players have 50% fitness etc). The word fit is important there: if you want to do well in the league, cup and shield, you'll need around 20 good players that you rotate through. Rotation I think is underrated: even if you don't have the best squad, a 2016/17 Zidane-esque rotation policy can win you trophies.
With that disclaimer, these are the tactics that I use:
4-3-3 B Attacking mentality, normal tackling, mixed/direct passing (depending on relative rating of midfielders/forwards), mixed attack (down both flanks if you have v. good wingers), fast tempo and all over pressing generally ensures you beat teams that are worse than you. Against roughly equally-rated opponents, use hard tackling.
Against stronger opposition, defensive mentality, hard tackling, mixed passing, mixed/down both flanks attack (depending on relative strength of their full backs/your wingers), normal tempo and own half pressing works well. As for formation, 4-3-3 B is still good, although if the opponent is significantly stronger, you might like to consider 5 at the back.
Of course, use substitutions effectively. I tend to make changes at 60 mins. If I'm losing, I switch to aggressive tackling and direct passing. If I'm winning against weaker opposition, I change to a more defensive mentality and sub players off to give them rest (if necessary).