Depends on whats causing the gyno. Gyno can be caused by many things, or combinations of things. Progesterone, estrogen, IGF-1, prolactine to name some.
Anastrozoles primary job is to prevent aromatization of test into estrogen. Tren does not aromatize, but does have an affinity to the PR receptor and it also increases IGF-1. SO if your gyno is caused by high levels of IGF-1 AND PR, then your best bet may just be using nolva since it affects HG and IGF-1.