I had the YGs in for an extended audition, 3 weeks, before deciding to get them. I was very skeptical that they would be better than the XLF. I told the dealer who wanted me to do the audition that he would be wasting his time, there was no way the YGs would beat the XLFs. To my surprise, the YG play music on recordings that the XLF just don't, music I never knew was there. For example, the "I heard it, I saw it" vocal on The Who, Tommy, 1921 -- it was plainly heard with the YGs. It was a bit jarring hearing that for the first time on a record I had heard hundreds of times before. Then I noticed the same thing on virtually every recording. With the YG I can hear the strings in the string section rather than the string section, the voices in the chorus instead of just the chorus. I have a buddy who has XLFs so I still hear them a lot. Bass with the YGs is deeper and tighter. The XLF sound kind of muddy by comparison. On a track like Springsteen DOTEOT, Garry Tallent's bass is precisely placed and does not seem to stray like it does with the XLF. Of course this was only noticed when compared to the YGs.
For me, the excitement factor was with the YGs. IMO, overall, it was not really close. But others are free to disagree and tell me I am wrong.