Do you own either of these instruments, or on what basis do you make
your recommendation?

Yes i have had a Cap Wizard for years .
When i was looking into buying one i studied the internet and peoples
reviews of several testers .
The Bob Barker is of coarse a very good unit no doubt .
The Cap Wizard is quicker to use and detects even the hard to detect
caps under circuitry . Its like going from the ``test light`` to a
deluxe instrument . You dont need to read and calculate any numbers ,
just listen for a beep or/and look at the meter

I have the Bob Parker one and it is perfect for the job.
Chris