The two machines pull double duty as 24/7 heating units during the colder months, so what would be their most effective contribution to the Tor ecology? Relay/relay, relay/bridge, or bridge/bridge? (During the hottest week I only keep one computer going and perforce operate a solo relay.)
I guess better would be relay/relay if bandwidth is not the issue. According to FAQ[1] running bridge is recommended in that case.
I run this bridge on one of my VPS because this hosting provider is against proxies and they give only 1 Tb traffic per month. They are not DO. Bridge should not give them any troubles.
[1] https://www.torproject.org/docs/faq.html.en#RelayOrBridge