I haven't tried Rogaine. I was losing hairs after I started T, and I wasn't sure whether it was incipient baldness or just my hairline shift. My doctor suggested Rogaine, but that product doesn't do anything for a receding hairline, and I didn't seem to have male pattern baldness. So I wound up getting a prescription for Finasteride. When I shampoo, I still lose more hairs than I did pre-T, but my hairline isn't receding anymore, and I don't seem to be losing any volume. So I don't know what is going on.
I'm still on Finasteride, and I'm not sure whether I'll keep it up. I don't have any unpleasant side effects, but I also can't tell whether it has slowed down my masculinization process at all.