Bitshares is the initial brother of STEEM made on same system. Main difference is that BTS has fees and STEEM has none.
Of course there is more but this one is crucial. Anything done on BTS chain needs payment when on STEEM we can send coins or vote with 0 fees on that.
Lets see how BTS is right now.
Currently above STEEM but below Bytecoin. BCN (Bytecoin) is nothing interesting just has loads of coins and is old so has good MarketCap place. You can mine it sometimes on MingerGate - check my post about mining HERE.
China totally drives the volume and price, worth to note that BAE is actually same as OpenLedger account wise, who has Peerplays as main volume. PPY is another brother of STEEM.
Arbitrage Options
Not really, everything is close and other markets have no big volumes.
Volume by Exchange
Coins mentioned in post: