They don't target the same user segment. The C7 will start having a lot of trouble as soon as you try to run a VPN server on it, do full NAT/routing at gigabit

They don't target the same user segment. The C7 will start having a lot of trouble as soon as you try to run a VPN server on it, do full NAT/routing at gigabit line speed, or need to handle multiple VLANs. All of that has to be handled by the frankly underpowered CPU on the C7. The TO will chew through that pretty easily. A lot of it is handled in software as well (I believe VLANs are handled in the silicon, though), but the beefier CPU means it won't choke as quickly. I use my C7 as a dumb access point. It literally only needs to handle the encryption for a few wifi networks, and transpose the traffic into the proper VLAN. No routing, no connection tracking, no NATing. My EdgeRouter handles all of that, and does it very well.