It sounds like a politician's answer, but I honestly believe that almost everyone in this century adds something I want to keep, but I have a difficult time viewing myself as a disciple of any one of them. But these categories are rather simplistic. Both men had problems in their theology and philosophy, and both made major contributions to the field. Yes . . . I think one lesson is the importance of philosophy for theology, and also for living the Christian life.
Philosophy shapes our Christian worldview, which in turn guides our practice.
So Christian leadership of all types needs to have at least some concern for philosophical issues. Perhaps this answer reflects a hubris of the present, but it seems that the 19th century had all the attractive features and the problems of adolescence. It was a very energetic and optimistic age, far too optimistic about human possibilities, as the 20th century has tragically revealed. Like teenagers, they felt confined by history and tradition, and stepping out of the formulas of the past allowed them to see things in ways that have radically shaped the thought of the 20th century. At the same time, they made some serious errors, in my estimation, that closer attention to history and tradition could have allowed them to avoid.