Issuing Custom Assets
Ethereum and Bitshares - yes
Visibility
Each has its own visibility and uses which you are looking into and will discover pros and cons of each with tools available for the different chains.
Fees, transaction speed and scalability
Here Steem is best in class, with zero transaction fees. - Yes Bitshares speed and scalability is proving good as well.
Ethereum has more Dapp possibilities with existing code however bitshares or STEEM could be used depending on your project possiblities.
Of course use what you understand and works for you
So matter of balancing out pros and cons of each for your project (and developers).