Live match is relevant but i only base this on the stats the actual in game footage is very random at times.

I check the stats and if my opponent is dominating shots etc then i switch mentality and see if that makes any difference.

I will always set my team up to nullify my opponent as best i can, always try to have one more defender than his attacking players.

Play around with different mentalities, for me attacking mentality is working very well this season and against superior (GOD teams) i find hard attacking works really well.
I dont think playing defensive has many advantages within the match engine this season.
In the past defensive was very OP, but for me attacking works best.