I am quite sure live band will definitely sound worse than most sound systems.

My experience is I hanged out with one band in a garage where they were practicing and I attended couple live music shows in pubs.

Main upside of those live music shows is that they are not "perfect" like playing a record and each one of the gigs will be off here or there, tempo somewhere will be off or a tune will be off - or you are just having enough beers you don't care pick your way :)