Who should I take to a concert with me? My best friend or boyfriend?

Ok, so, I'm getting tickets for Hollywood Undead and I don't know who to take, my best friend or boyfriend. They both love HU but I think my boyfriend likes them more. A couple months ago I asked my best friend and she said she couldn't so I asked my boyfriend but now she messaged me and said she could! I personally think I should take my boyfriend since my best friend went to a concert with her other friend, Emma, instead of me. It seems fair. And I think it would be a good date for me and my bf. I don't know how to tell her though, I don't want her to be mad. I want her to understand! Please help, the concert is less than a week away! Thanks everyone, xoxo.