sorry :D it really depends on your requirements. If Hugo in its current state covers you or if you can live with a light toolchain around Hugo go Hugo (I think many people do not need to touch the go code). There is nobody saying that you cannot write a little python code which is run before/after hugo (actually some people are doing that!). But if you want total control/extensibility with your python code in the page generator the Lektor plugin system will give you more power.