awesome.     Is there any other exchange to buy bitsharesx besides bter?      
Why is btsx better than nxt or counterparty     
still learning.  haha
Yes, you can buy btsx on btc38.com, coinport.com and poloniex.com. I would suggest btc38. For why Bitshares X is better than nxt or counterparty you should refer to the 
 Why choose BitShares  section of the 
 wiki . 
In a nutshell, BitShares X is faster then those systems (10 second confirmations) more secure than those systems and more scalable than those systems (
DPOS  can allow for these networks to scale to visa level transaction loads). Additionally, users can register names on the blockchain and users can send to named accounts anonymously. 
 TITAN (or Transfer Invisibly To Any Name) allows for enhanced security and anonymity through the use of automated stealth addresses for each transaction. 
Oh and 
 market-pegged  assets like BitUSD and BitCNY are being launched in a few days.