Philadelphia has the better lineup. I live a few blocks from Grand Park where the LA MiA concert will be held, and I can tell you that a lot of people that bought early are selling their tickets now that the lineup has been revealed.
FYF has a
much better lineup and is half the price.
I would mind seeing Kendrick Lamar and Ab Soul at MiA, but hey, I get so see Earl Sweatshirt at FYF this summer so that makes up for it.
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In terms of which will be the better show, I don't know much about the Philly venue, but there are serious doubts as to whether DTLA's Grand Park can handle those kinds of crowds. Its big but its not that big. I was there for this past NYE celebration and it was so jammed that it took like 45 minutes to get out.
Grand Park