Depend of the scenario.

Sometimes for example, when the other team play attacking mentality, so starts doing his game in your field and pushing, it can be good play defensive because they push and have the defense line near midfield, in the case of the hard attacking.... (let me remind the scenarios lol)... if the other team have lots of players in defense + attacking maybe the hard attacking will have a effect of many players pushing his defense meanwhile the ST's-AMs and MCs are pushing so neutralized...

Well there are many combinations of these scenarios/situations, as switch attacking to defensive or vice' can be good, and I do this to overcome some situations -such as play very defensive-, too of course, in some scenarios play the hard attacking will help.

Advantadge? no. Advantadge is when you have only 1 8* potatoe player that never appear and you decide sack him and buy a 5* well programmed that win half league title for you, the players individually are an advantadge for his contribution, but the formations and orders have a minor impact if we compare.