The reasons why the MFJ isn't the better choice.
1. Uses 10 batteries, eats them quick, Rigexpert uses 2
2. Battery charger on MFJ useless
3. Touchy over sensitive controls
4. Limited functions, no SWR or other scanning, no plot graphs, no memory bands, no multiband scanning, and more.
5. Bulky, heavier, no lighted screen.
6. Costs more depending on Rig expert model.
Basically the MFJ was good in it's day but now it's antiquated.
Notice MFJ makes a version like the Rig expert to compete with.