Countering your opponents using their previous battle data is most of the times dangerous as you don't know if you're countering a counter. I currently go for playing my best team depending on the ruleset.
Being stucked in the Bronze league for many months, I noticed that most bots are NOT countering their opponents. Most bots are either copying or recording their best encounter and applying that to their own advantage.
This is very noticeable during the recent update of starter cards. The bots didn't use any of the CL starter cards that are available to them because they rely on the data that they had previously gathered. :)