I don’t thin Xfrog is going to be your answer. It can make good looking trees but they are pretty heavy and animation capabilities are limited.
I’m not that familiar with it, but you might check out Samir’s DPIT Nature Spirit plugin. It seems similar to Xfrog, but with more add-ons. In particular, it has a volumetric instancing capability that allows you to use huge numbers of trees without a huge RAM penalty.