They are orthogonal tools. They blend together nicely. I use both on our infrastructure.
Jumpstart is an amazing starter kit (starter kit doesn't do it justice) that gives you accounts, billing, notifications, etc. and Avo takes it over and gives you the ability to build your admin panel/back-office fast AF. It's like you replace rails_admin from Jumpstart.
I've spoken with Chris Oliver and started work on adding Avo to Jumpstart and to have it as an alternative to rails_admin.
