1. All of the named solutions are still based on centralized clearing servers, which means they can be taken down by will. This also means that actions and personal data of their users can be affected by the service administrators. Finally, the UI/UX is greatly falling behind modern standards.
2. We are well aware of 0x and Raiden and we're not competing with them, instead our solution is based upon the existing work made by cool people behind these projects.
3. xChainge team is the first team who set out to get rid of the "servers" in a traditional way, where they are under control of one single organization.
We are also embedding all the needed cryptocurrency services into a single application. No longer will a user's workflow remind shuffling a deck of cards: wallet - switch - exchange - switch - contract builder - switch - wallet - switch, etc. xChainge puts everything close together within one window.
Our team boasts professional UI designers of financial applications, who know to make an app that anyone could and would want to use.
Thank you for your question
As i know all of this project are decentralized or named decentralized by devs. They are p2p platforms/protocols.
About user friendly UX/Ui - its not most important thing in decentralized exchange (take a look at etherdelta with terrible interface).