Hm... a different door to the same house?
OpenLedger and bitshares.org are different ways to access the bitshares blockchain. It is the same blockchain though, you access the same account from both. OpenLedger is simply a company that built it's service on top of the bitshares blockchain. They have a support team, operate gateways to other blockchains, so you can trade their tokens on the bitshares blockchain. RuDEX is the same.
RE: Keep Your EOS Safe after June 1st with OpenLedger DEX