As a former UFT user, I looked into both Legacy and TMG with the demise of UFT. Things that sold me on TMG was the reporting capability, sourcing features, flexibility in structuring your own sentences for reports, etc., in other words many of the features I was making extensive use of in UFT. Additionally in order to transfer my data to Legacy I would have to use GEDCOM and would lose much of my UFT data. TMG GenBridge transferred everything.
But this is only my opinion, and my advice to anyone transferring is, and has always been, to look at the options and make your own decision about what is best for you.