Better to buy on app or computer?

I'm trying to buy Justin Bieber tickets on Friday @ 10 (i know its better to do resale but I just can't) I'm going to be in school on Friday in class.
I'm trying to get the cheapest in a specific section.
Would you recommend using the Ticketmaster app on my iPhone or using safari on my phone

When my wife tried to get tickets to Maroon 5 she gave regretted not signing up for his fan club to get first chance at tickets.
I think the app would be better but it might be better to buy form computer according to one of the Android version reviews. I can't see iPhone app reviews without opining iTunes