I'll probably get a lot of flack over this, but I've never considered FM a particularly good source for serious listening. The best it can hope to be is a close approximation of the source material being broadcast. The better the tuner, the better that approximation, IMHO.
There's no question there are tuners out there that are better than others, but I've never heard one that actually "blew away" the other.
When I first switched from "ordinary" stereo equipment, to high-end, I used the tuner portion of a Lafayette receiver until I could afford the then $500 price tag of a Luxman tuner. When I finally did purchase that Luxman, and replaced the Lafayette receiver, the primary differences that I noted were a complete lack of interstation noise (Lafayette's tuners were OK, but their FM muting circuits stunk); a delightful "feel" to the large tuning knob; the ease with which I could spin the tuning knob all across the tuning dial; and the manner in which the station indicator blinked continuously until the station was found, and then stayed on steadily. Insofar as the
sound, however, I noticed only a slight improvement. Considering the fact that the Luxman tuner alone cost as much as the Lafayette 4-channel receiver, I was expectiong a good deal more.
I've gone through several tuners since the Luxman, and am presently using a TOTL Parasound unit. Still, I rarely listen to FM. Digiital tuners do a vastly superior job of locking onto a station's broadcast frequency and staying there (as opposed to the annoying "drift" of older models) but lack that intrinsic feel of quality of older units. And, no digital tuner has the pizzazz of a Marantz with an oscilloscope!
Again, just my 2 cents.