4x4junkie
Explorer
I'm not familiar with the DR-638 and DB-750 specifically, however what I've observed comparing a Yaesu FT-8800 to other part-90 (commercial) offerings is that receiving & transmitting performance is right about on par (the Yaesu's receiver had excellent sensitivity, no observable intermod on various antennas base or mobile in & around Los Angeles, and transmitted audio was actually a little clearer & louder. I would think a 7900 would be similar but I haven't checked... I do know some of Yaesu's older models were more prone to intermod). There were stark differences in durability & construction however. The Yaesu has fragile knobs and a plastic face panel that could easily be damaged if you were to accidentally put your knee into it or snag it with something while entering or exiting the vehicle. Commercial radios typically have a far sturdier chassis. They also tend to be better sealed against dust and water (or coffee) being splashed onto them.Is there any benefit to a Yaesu like the 7900 over a radio like the Alinco DR-638 or Powerwerx DB-750X? There really isn't a huge price difference for what seems like quite a bit more functionality. Is there a quality difference?
So if performance & features is your concern, the Yaesu probably won't disappoint. However if the radio is gonna get knocked around a lot, then a part-90 unit might do you better.