A cellphone clip is more likely to be a realistic portrayal of a live performance rather than a professional one, the latter of which tends to be "doctored" and fixed up nicely to make the singer and/or band sound as good as possible. A cellphone clip, albeit raw in sound quality, is how one hears it at the concert.
Have you ever listened to a cellphone mic recording and thought, "good god, that's how I sound?"
Cellphone mics are getting better all the time, but they are still not going to capture how that audio really sounded in the theater. Not even close.
For one, there's heavy compression going on. Secondly, there's no EQ or clarity to the recording. You've got an algorithm taking that blaring loud volume, squashing it, and then making some very crude EQ adjustments based on what it thinks will sound good coming out of that tiny speaker.
A non-overdubbed soundboard recording is much better to inform you of the quality of the performance, but even then further doctoring "needs" to happen to help emulate how that show sounded in the theater. This, a lot of times, will involved compression, reverb, EQ, etc., all to take that raw audio and reproduce the effect of it being played in a large auditorium.