Merger of equals - Is that so?

Towers Perrin and Watson Wyatt announced that there were conducting a merger of equals yesterday. If that is the case, and this becomes successful, then it will be a first for sure. I have always felt that when someone says merger of equals, then really it means a merger of unequals with the stronger partner soon taking over the weaker one. In this case who is the stronger? Possibly Wyatt - and how do i say that - because the Wyatt CEO is continuing as CEO. The last time I heard of a merger of equals was Daimler Chrysler - and we all know what happened there. This "merger" will be interesting to watch - the two have somewhat different cultures.