I decided to do a side by side comparison of OPI’s Teenage Dream from the Katy Perry Collection and the unnamed pink glitter from the Fall Urban Outfitters Boxed Set.
They look relatively similar in the bottle, but when worn Teenage Dream has better coverage, you can not see the nail line with two coats. The pink glitter base is very similar and from far away you can not really tell the difference between the polishes. The Urban Outfitters polish has smaller holographic pieces and has a smoother texture when applied. I personally prefer OPI’s Teenage Dream, but the Urban Outfitters was a much better deal. See a more detailed review of Teenage Dream here: https://blahblueblog.wordpress.com/2011/12/04/teenage-dream/
Here are side by side close up comparisons: