I guess it all depends upon what you started out with. I started using Tunercat nearly 20 years ago, so for me its perfectly intuitive.
I also bought the OBD2 software the moment it was available, so I don't deal with any licensing nonsense. I can program any PCM
I want any time I want. The downside is that there really isn't any scantool software available for the Tunercat interface cable (at
least none that I'm aware of - someone correct me if I'm wrong here). I also own and use HPTuners, so I rely on that for scanning/
datalogging.

The advantage of EFILive over Tunercat is that its a better integrated package. All of the scanning/editing/flashing utilities are nicely
integrated into one package and one basic user interface. The same can be said of HPTuners, but they don't support the Roadrunner.

-Scott