Neither, the game is too random.

If you have a high quality team you get put against high quality teams too so there is no benefit. The Cup becomes impossible, plus the league becomes harder too.

Its irrelevant if you have 4 star players in your team, 6 star players or 9 star players as once the draws for the league/cup are made your team will be bunched up with teams of similar quality. Therefore form is what is important.

As a result, having a inform 4 star player is easier than having an inform 9 star player. Work, time, effort and tactics have to go into maintaining a high quality player, but anyone can have a 4 star player who hits loads against similar rated opposition.

The game is too flawed and limited that anyone who thinks they can tinker with formations, with players and with tactics and that it makes a blind bit of difference is deluded. The results are pre-determined before the games even start, with only slight different outcomes set up for changes that are made during the game. Anyone who thinks they are actually impacting the outcome of a game once it starts, other than very minutely, is stupid. Its random number generating against random number generating, meaning its irrelevant what tactic you play, its how the dice roll.