Verso and EcuTek are not hardware, they are simply cracking the code and re-writing the software that is inside the existing ECU that the car already has. (where possible)
This has advantages and disadvantages.
All the others you mentioned are replacement engine control units that can be reprogrammed to your desired settings using the software that comes with the unit.
MoTeC and Autronic are the high end of the market with advanced features. Power FC, Microtec, Link etc are less expensive and offer varying degrees of features.