I personally have had a preference for analog Spectrum analyzers for measurements. I've always had trouble accepting sampling rates, windowing, ... of the digital SA's. I have used recievers only twice. But that's just me. If I can measure the same field strength with a digital SA or analog SA or a reciever, so what?
Well, the "so what" is why I'm asking two questions: (1) Given the same EUT setup <whatever you want it to be> and the same antenna setup <again, whatever you want it to be>, Which would you choose digital SA (dSA), analog SA (aSA), or reciever? (2) Given the same EUT setup <whatever you want it to be> and the same antenna setup <again, whatever you want it to be>, how close should each measurement made by dSA, aSA, or reciever be? Identical?