It runs on both blockchains in parallel, one can backup the other at any time. Using Steem's trending / hot again would be really easy, I just don't expect to want to use it again. But otherwise there's not one blockchain coded to be 'superior' to the other in the UI, it's just the vote a tag thingy I cant do on STEEM atm, and it would just require adding a 'memo' into the vote operation basically.