Currently, the only use of DAG technology in the market are IOTA,BYTEBALL and ADK.
What is ADK and why IOTA is any better than byteball?
Byteball and IOTA are apple and orange. They are not comparable. They are different in everything. Here are some examples:
In term of software design, Byteball uses a third party called witnesses (which are more like the delegates in Bitshare) to validate the transactions and has transaction fees while IOTA uses the users themselves to validate the transactions and has no transaction fees. Byteball has her own unique distributed ledger while IOTA also has her own unique distributed ledger which is called Tangle. Also Byteball was not designed to resist the quantum computer attack while IOTA is designed to be able to resist the quantum computer attack.
In term of market target, Byteball initially targets the financial assets market such as stocks and bonds( you can see this from their website) while IOTA initially targets the IOT trasnaction settlement and data security market.
In term of business model, Byteball is trying to expand her user base by free air dropping their coins to bitcoins holders while IOTA team is almost exclusively focusing on working with real world IOT related companies to build real world IOTA projects (
https://forum.iota.org/t/publicly-announced-iota-real-world-projects-tracker/1820).