I hated the Boppy, but loved My Brest Friend. Loved it. I found it much more supportive for breastfeeding.
I have a Boppy and while it was useful, my close friend who had a DS 2 months after mine was born has a Brest Friend, and when we'd hang together, I definitely envied her pillow over mine.
I'd do the Brest Friend over the Boppy since you've got it, but otherwise, I don't think it's a huge inconvenience to take both.