(Just saying this: it is better to use the edit button than to add new replies that fast).
Formation: It would depend on what is your rival using. You would use one that matches your rival's. As for one that would fit more cases than others, I don't know. I would consider a 4-4-2 or a 4-2-3-1 narrow (3xAMC).
Philosophy: As you go more defending the tactic creator would tend to instructions that reduce the pressure and focus more on keeping men behind the ball, so you would use more attacking tactics. So you would use attacking philosophy. You might then want to consider tweaking the manual sliders for some parts if you want a slower rhythm of place than the faster pace, longer passes, etc. Or you could just change the closing down instructions to one of the defensive ones. So if you don't want manual chances, then the more attacking; if you don't mind manual tweaks then I don't think you'd need to retrain to the more offensive.
Width: As with formation, it would me match your rival, not going too much narrower.
Marking: man marking would be the more fitting to follow players getting in the same area.