There is a real market for smart contracts, and Ethereum is well placed in this domain. Maybe other projects will raise in the coming years (NEO...), but ETH was ready first !
I think Bitshares don't need to be compared with ETH. Moreover, BTS is world champion in 2 domains :

• Really decentralised, so that no bank or financial fund or state will ever own it
• Not mined but POS, so that it won't cost more and more to run

The problem is to have everyone aware about that !