I think Streamr DATA coin is much better than both IOTA and IoTeX. These guys have been working silently for years, they have a working platform that is proven to work and not just some vaporware. They are not very aggresive with marketing, though and going under the radar, I think.
From what I know, Streamr DATA is a very solid and long time developed project, but it's focused on a specific application (data streaming), while IoTeX aims to become the infrastructure of the IoT i.e. if you are a IoT device manufacturer, you can start your own subchain off the IoTeX network and immediately get a blockchain for your own devices which is tailored for your devices. Indeed you can decide wether your subchain requires full privacy or not, if it requires its own token or not, and still your devices will be able to interact almost instantly with any other device located into any other subchain thanks to an advanced cross-chain communication capability.
Thanks to their
DKSAP-IoT innovation (and many more to come) IoTeX can run caomplicated cryptography to achieve full privacy even on low-powered devices.
Very soon it will be very easy for any manufacturer (wheter it is about personal IoT devices, autonomous cars, or home appliances manufacturer) to release its own IoT full fledged blockchain very easily. It's expected thousands of subchains to be started in the beginning by small IoT manufacturers, all of them able to communicate each other very quickcly (see the
IoTeX own Roll-DPoS consensus, which allows for instant finality of transactions and massive scalability of the network), allowing for smart contracts, full privacy and much more.
The IoTeX blockchain is based off extremely solid technologies which have beed (and are being) innovated by one of the most knowledgable and reliable teams in the blockchain space, please have a look at the official website
www.iotex.io!
I highly suggest you to join the official Telegram group for a while to get an idea of the top level team behind this project:
https://t.me/IoTeXGroupHere the link to the White paper:
https://iotex.io/white-paperHere the link to the Yellow paper:
https://iotex.io/yellow-paperHere the link to the DKSAP-IoT paper:
https://iotex.io/dksap-iotHere the link to the roadmap:
https://imgur.com/4FnpoB8