Yellow tank with purlpe flanks vs rainbow team

Hi!

We have started a discussion the day in my alliance whether is it better to have rainbow teams (with yellow tanks) in wars, or rainbow teams.

It is also interesting whether is it the same for blue-green-red tanks with heroes on the flanks of the complementer color and (versus) yellow-purple tanks. And finally, is there a (practical) difference between yellow and purple tanks with complementer heroes on both sides?

It would be appreciated if you coluld share your ideas.

Thank you in advance!