Chose Ambassador
I have not used too much software for the said purpose, but in comparison to the ones I have used, this one seems to be the most user-friendly and intuitive to use. That's the whole idea when you are paying for software: to cut down on admin work and save time.
Independently Invited by TrustRadius
A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info