Here's a comparison of two very similar flaky topcoats: Nubar 2010 and Sally Hansen Hidden Treasure. I chose purple and red as the base polishes because I think each one brings out different colors from the iridescent flakes.
Purple: Orly Charged Up; Red: Sally Hansen Cerise Noir.
I also compared the two flakies over another pair of purple and red polishes which are slightly lighter. To be honest, I'm not really sure what my logic was at the time. How is this more helpful than the last picture? Who knows! But I might as well show you all the pictures I took in case it might be useful somehow! =)
Purple: OPI Funky Donkey; Red: OPI Manicurist of Seville.
One of my first observations is that Nubar 2010 is not quite as dense as Sally Hansen Hidden Treasure. It's a very subtle difference, but still there. I'm not sure if this is because HT has more flakes packed into the formula, or if it's due to the overwhelming mop-like brush that the Complete Salon Manicure has. I definitely prefer Nubar's brush to Sally Hansen's. Aside from that, I think the two polishes are basically identical. They both seem to have the same spectrum of iridescence and react to the light in the same ways.
Sally Hansen Hidden Treasure was a limited edition release a couple years ago, but Nubar 2010 is available on their website for $7.50. The ease of obtaining 2010 is another point in its favor, I think!