I would never use drol and tren at the same time simple because they seem to share common sideeffects.
Being horrible appetite loss and blood pressure increases.
Dbol while not light on the BP, is better than drol at a useful dosage, and while it does have some estrogenic sides that are quite potent, that can be fairly well controlled with letro or even adex properly dosed in combination with even large doses of test.
Dbol also seems to stimulate appetite and signifigantly elevate mood which is a boon with tren as any regular user can attest.
Generally with high dose tren be prepared for a little battle until the sides calm down.