As for me,I prefer TransX because it can design more complicated trajectory like voyager,cassini and so on,but it has its drawbacks,TransX doesn't have autopilot function,which means your manual burn may be not accurate.
I also have two questions,even if I turn off the perturbation in orbiter launch pad,the data showed in TransX changes slowly after a mid-course correction and I had to make another correction burn when I'm about to approaching the planet,why? Another question,can we add the low engine calculation function to design the orbit like dawn?