Can anyone tell me why someone would want their smart contracts running on Counterparty instead of Ethereum? Is there any advantage besides the security of the Bitcoin blockchain vs the security of the Ethereum blockchain?
From a token/asset view point there are some differences. In Counterparty, the tokens are "Global" meaning that anyone can view the tokens transaction, balances, credits/debits easily as it is encoded on a protocol level. In Ethereum (at the moment), the tokens are part of a "smart contract", they are not "global" in sense. Token/Asset names in Counterparty are unique, where else duplicate token names can be used in Ethereum if they are part of a different contract.
I don't particularly think one is better than the other. Each has its own use cases