The kv1 clone and panther escq tanks from ukf exclude eachother, you cant have a basic churchill and comet be build by the same player. Something neither axis has to choose between.
You have to choose between them based on cost. Axis doesn't have a cheaper heavy that compares to Churchill or kv1
If they want a heavy it's 230 fuel at minimum. Spending that much on one unit inevitably keeps you from getting others