Here is some feature about eCom, SD Connect C4 and Xentry Connect . Hope can help you choose right tool.
eCom – laboratory\development tool. Most cheap and light. Can’t be used with DAS\HHT vehicles. Does not support kline communication. Need to be specially setup on any diag sw installation.
SDConnect C4– workshop\robust tool. Most universal in use. The only limitation is kline communication in Vediamo from ver5* Easy to setup. In most cases work as is. As for China clones, SDconnect has the best PCB design, the winner.
Xentry Connect – workshop\robust tool. Very big and heavy. Most expensive. Similar to SDConnect because it is like PC+multiplexer in one housing .Has very specific setup as update blue ray disk has not installer but full HDD image with OS + user application. Complicated in installing additional software as you do not have direct assess to operating system.